According to their website, Presearch is a "decentralized search engine to search privately and receive better results powered by blockchain technology". Basically, they pay you 0.12 PRE (their token) per search and it's a feature that goes well in hand with Brave's BAT and the Swash extension, the holy trinity of free long-term crypto.
How to use PRESEARCH with Brave
It's very easy to set Presearch as the default search engine on a PC, you just need to install the extension or visit brave://settings/ and change it in the search engine section, but when we try to do it on BRAVE mobile we discover that there is a limited list of options and no way to add one!
Once you finish, don't forget to log in to your account and start earning your sweet tokens!