Conversion rate is the share of your website visitors who take the action you want, whether that is calling, booking, filling in a form, or buying, divided by everyone who came. It is usually written as a percentage: the count who acted over the count who visited.
For a small business, this is the number that tells you whether traffic is actually paying off. You can double your visitors and earn nothing new if none of them act, so a steady conversion rate often matters more than a raw visit count. It is where a clear call to action, a page that loads fast, and copy that answers the visitor’s real question do their work. A well-built landing page exists almost entirely to move this number, and a high bounce rate is often the first sign it is leaking.
You can watch your own conversion rate once you decide what counts as an action worth measuring. I build sites so the path from landing to that action is short and obvious, because a visitor cannot convert on a page that hides what to do next, or makes them wait to find out.