They have different purposes such as, for example, allow you to navigate efficiently between pages, remember your favourite sites and, in general, improve the browsing experience.
Zinezinjongo ezahlukahlukene ezifana, ngokwesibonelo, ukuvumela ukuthi uzulazule phakathi kwamakhasi kahle, ukhumbule amasayithi akho owathandayo, futhi, ngokujwayelekile, uthuthukise umuzwa wokuphequlula.