Marketing Dictionary

API (Application Programming Interface) defines how software components should interact. In marketing, APIs connect your CRM with ad platforms, pull analytics data into dashboards, or automate email campaigns. Companies like Google, Meta, and Salesforce expose APIs that let marketers programmatically manage campaigns, audiences, and reporting without manual work.

Bounce rate measures the percentage of visitors who land on a page and leave without clicking anywhere, filling a form, or visiting another page. A high bounce rate (60%+) often signals that the page content doesn't match the visitor's intent, the page loads too slowly, or the design pushes people away. However, bounce rate can be misleading for blogs or single-page sites where a 'bounce' might actually be a successful read.

Cost Per Acquisition (CPA) divides total campaign spend by the number of conversions attributed to it. It's the ultimate efficiency metric for performance marketing. If a Facebook campaign spent $5,000 and generated 50 purchases, the CPA is $100. Knowing your target CPA (often set at 20-30% of customer lifetime value) determines whether a channel is worth scaling.

Cost Per Click (CPC) is the price an advertiser pays for a single click in pay-per-click (PPC) campaigns. CPC varies by industry, keyword competition, and quality score. Highly commercial queries like 'car insurance' can have CPCs above $50, while long-tail informational keywords may cost under $0.50. Lowering CPC while maintaining conversion rate is a core optimization goal for search advertisers.

Cost Per Mille (CPM, from Latin 'mille' for thousand) measures how much an advertiser pays for 1,000 ad impressions. It is the standard pricing model for awareness campaigns on platforms like YouTube, programmatic display, and social media. CPM rates vary widely: niche B2B audiences might command $30+ CPM, while broad consumer targeting can be under $5. CPM campaigns prioritize reach over direct response.

Customer Relationship Management (CRM) platforms store contact details, track communication history, manage sales pipelines, and automate follow-ups. Popular CRMs include Salesforce, HubSpot, and Zoho. For marketers, a CRM is the single source of truth for lead scoring, email segmentation, and attributing revenue to specific campaigns. Integrating your ad platforms with CRM enables closed-loop reporting.

Click-Through Rate (CTR) is calculated as clicks divided by impressions, multiplied by 100. It measures how compelling your creative and copy are at driving action. Average CTR varies by channel: search ads average 3-5%, display ads around 0.5%, and email campaigns 2-5%. Improving CTR often involves testing headlines, calls-to-action, imagery, and audience targeting.

Conversion Rate (CVR) measures how effectively your funnel turns visitors into leads or customers. A conversion can be a purchase, a form submission, a sign-up, or any defined goal. E-commerce sites average 2-5% CVR, while B2B landing pages might convert at 10-20%. Optimising CVR (CRO) involves testing page layout, copy, form fields, load speed, and trust signals.

DAU (Daily Active Users) and MAU (Monthly Active Users) measure how many unique users engage with a product in a day versus a month. The DAU/MAU ratio (also called stickiness) indicates user retention: a ratio above 50% means the average user opens the app more than 15 days per month. These metrics are critical for SaaS, mobile apps, and content platforms to gauge product-market fit and churn risk.

HEAT (Highest Earning Available Tomorrow) is a search advertising approach where bids are concentrated on the single keyword predicted to generate the most revenue on the following day. Rather than spreading budget across dozens of keywords, HEAT uses historical performance data and predictive models to pick one high-converting term each day. It is a high-risk, high-reward strategy often used in aggressive performance marketing.

Key Performance Indicators (KPIs) help marketers and businesses quantify success. Common marketing KPIs include customer acquisition cost (CAC), return on ad spend (ROAS), conversion rate, email open rate, and net promoter score (NPS). Good KPIs follow the SMART framework: Specific, Measurable, Achievable, Relevant, and Time-bound. Without clear KPIs, it's impossible to determine whether a campaign or strategy is working.

Lifetime Value (LTV or CLV) projects the net profit attributed to a customer throughout their relationship with the company. LTV helps determine how much you can afford to spend on acquiring a customer (maximum CAC). A healthy business typically aims for an LTV:CAC ratio of 3:1 or higher. Improving LTV involves increasing purchase frequency, average order value, and retention rates through upsells, subscriptions, and loyalty programs.

Pay Per Click (PPC) is the backbone of search engine advertising (Google Ads, Bing Ads) and social media ads. Advertisers bid on keywords or audiences, and the platform charges only when someone clicks. PPC is attractive because spending directly ties to engagement. Success in PPC depends on keyword research, ad copy quality, landing page relevance, and bid management. The average small business spends $9,000-$10,000 per month on Google Ads.

Return On Ad Spend (ROAS) is calculated as total conversion revenue divided by total ad spend. A ROAS of 4x means every $1 spent returns $4 in revenue. While similar to ROI, ROAS focuses specifically on advertising efficiency rather than overall campaign profitability. Target ROAS varies by business model: e-commerce often aims for 4x, while SaaS with high LTV can operate profitably at 2x.

Return On Investment (ROI) is the universal profitability metric: (gain from investment - cost of investment) / cost of investment × 100%. Unlike ROAS which only considers ad spend, ROI accounts for all costs including creative production, tools, salaries, and overhead. A campaign with 3x ROAS might have only 20% ROI after accounting for full costs. ROI is the metric executives care about most.

Search Engine Marketing (SEM) refers specifically to paid search ads (Google Ads, Bing Ads), as opposed to SEO which covers organic rankings. SEM lets businesses appear at the top of search results for commercial queries immediately, rather than waiting months for SEO to take effect. A typical SEM strategy combines branded keywords, competitor terms, and high-intent product searches. Budget allocation between SEM and SEO is a strategic decision based on timeline and competition.

Search Engine Optimisation (SEO) involves technical improvements, content creation, and link building to increase a site's visibility in search engines like Google. Key pillars include on-page SEO (title tags, meta descriptions, content quality), technical SEO (site speed, mobile-friendliness, structured data), and off-page SEO (backlinks, social signals). SEO is a long-term investment: it typically takes 3-6 months to see meaningful results, but the traffic is free and compounds over time.

Search Engine Results Page (SERP) features organic listings, paid ads, and rich elements like featured snippets, knowledge panels, image packs, and 'People also ask' boxes. Modern SERPs are highly visual and interactive — a query can show a map, local businesses, videos, and shopping results all on one page. SEOs optimise for SERP features beyond traditional blue links: appearing in position zero (featured snippet) can drive massive traffic even for users who don't click through.

UTM (Urchin Tracking Module) parameters are tags appended to URLs — utm_source, utm_medium, utm_campaign, utm_term, and utm_content — that tell Google Analytics exactly where a visitor came from. A standard UTM link looks like example.com/?utm_source=newsletter&utm_medium=email&utm_campaign=spring_sale. Consistent UTM naming conventions are essential for accurate campaign attribution; inconsistent tags create data noise that makes reporting unreliable.