Band Mate, like most other sites on the internet, makes use of cookies.
Here is an explanation of what cookies are, written by Google
An HTTP cookie—commonly referred to as just "cookie"—is a parcel of text sent back and forth between a web browser and the server it accesses. Its original purpose was to provide a state management mechanism between a web browser and a web server. Without a cookie (or a similar solution), a web server cannot distinguish between different users, or determine any relationship between sequential page visits made by the same user. For this reason, cookies are used to differentiate one user from another and to pass information from page to page during a single user's website session. A web server uses cookies to collect data about a given browser, along with the information requested and sent by the browser's operator (the visitor). Cookies do not identify people, but rather they are defined themselves by a combination of a computer, a user account, and a browser.
Band Mate uses cookies for two reasons:
We only use cookies to enhance your web experience. By tracking page statistics, we can assertain how people use the site, what devices they view the site with, what web browsers they use, and so forth. Through having access to this information, we can optimise the site for best performance for our users.