Definition
Title tags weigh keyword relevance heavily and decide click-through in the SERP. Effective titles front-load the target query, add a modifier or benefit, and stay under roughly 60 characters to avoid truncation.
Why it matters
Rewriting title tags remains among the highest-ROI minutes in SEO - same page, same links, better positioning and CTR within weeks.
Benchmarks
Primary keyword first 5 words; 50-60 characters total
All glossary terms