The percentage of users who take a desired action on a website.
Conversion rate is marketing statistic used to gauge the performance of a website converting visitors to customers. The primary example would be the number of website visitors that end up buying a product. The desired action does not have to be a purchase, it can be signing up for a mailing list or sharing a link as well. High conversion rates indicate the website is doing an effective job of directing the visitors to the products they need.