Title Tag
A title tag is the HTML element that sets a page title, shown by search engines as the clickable blue headline of a result and used in the browser tab, making it one of the strongest on-page signals for what a page is about.
The title tag lives in the head of the page and is the first thing both a search engine and a searcher read about it. Engines weight it heavily when deciding which query a page should rank for, so the primary keyword belongs near the front, phrased the way a real shopper would type it. A product title tag like "Merino Wool Crew Socks, 3-Pack" earns its place; a vague "Home" or a brand name on its own wastes the single most visible line you control.
Because it doubles as the headline in the result, the title tag also decides whether anyone clicks. Aim for roughly 50 to 60 characters so it does not get truncated, lead with the specific term, and let the tail carry the brand or a reason to click. Each page needs a distinct title; duplicate titles across a catalogue confuse engines and dilute relevance.
One honest caveat: search engines frequently rewrite title tags in the results, swapping in an H1 or other on-page text when they judge it a better match for the query. You cannot force your wording to appear, so write a title that is accurate and self-contained rather than stuffed, since a clear title is the one most likely to be kept.