A crypto faucet is a part of a website or app that rewards a small amount of crypto for viewing ads. There are many, many faucets that are very active in the year 2022. Normally, the website owner runs banner ads on the page where the faucet is located.
In order to stop bots from claiming this free crypto, a captcha or puzzle is required to be solved. This proves a human is viewing the ads and that the crypto is rewarded to real website visitors. Often times the website owner is paid per impression of an ad. Since each person that claims the crypto reward for the faucet also sees the ad, they each count as as an impression. This means that the website owner is happy to have you on their site, and you are happy to receive free crypto.