Hit may refer to any of the following:
1. With the Internet, a hit refers to each request made by a client to a server. For example, if someone visits a page with four images, there is a total of five hits. One for the text and one for each image loaded. Hits help detect abnormal traffic behavior, find out what areas their visitors enjoy most, and set price points for Internet advertising.
A hit is the server's load counts, not its unique visits, which is a page view.
2. With Mechanical Turk, HIT is short for human intelligence task. It is a task that is trivial for most humans to complete, but difficult or impossible to automate with a computer. These tasks could be something like identifying colors in an image, finding keywords in a sentence, comparing text, or completing a survey. Because of the difficulty level, these tasks do not pay a lot, but can easily be completed and be a source of supplemental income.