Lets read here.... below
There are wide range of websites that will pays small amounts of money in exchange for completing certain task. Most of the time these so-called- “faucets”- involve looking at ads in one way or other.
Basically, sites owners get paid when people who view and interact with ads. A some websites, such as btc faucets, will share some of those earnings with their visitors, What you have to do to earn your btc varies from website, to website. With some, you’ll kill aliens or feed animals, with others you’ll simply watch videos or click on ads.
Be warned, however, some websites will infect you with scams and viruses.