What is the difference between primary and secondary keywords?

Primary keywords are the core terms that directly represent the main topic or offering of a page or campaign. They are the most important terms you want to rank for. Secondary keywords, also known as long-tail keywords or supporting keywords, are variations of the primary keyword. They are typically more specific, often longer phrases, and help to capture a wider range of user intent while still being relevant to the primary topic. The other options are incorrect: Keyword length (single words vs. phrases) is not the defining difference; primary keywords can be phrases, and secondary keywords can sometimes be single words in specific contexts. Company size does not dictate keyword usage; both large and small businesses use primary and secondary keywords. Keyword cost in paid advertising is influenced by competition and bid strategy, not inherently by whether a keyword is primary or secondary.