Amateur Radio operators keep logbooks of the stations they’ve contacted for a few reasons. A) They’re handy if you have to prove you aren’t creating interference with neighbors, a business or government (it happens); B) they’re important for filling out a reply QSO card, and critical for contesting, or uploading your POTA/SOTA OPs; and C) They’re a personal memorialization of your day at the beach, that great time at Field Day, the Net you joined, and the thing you wave at your family to prove “See! I told you I worked Capetown!”
My logbook is definitely the latter.
Jarret Green KB0ICT wrote HAMRS for all of us. It’s one of several computer logbooks I like. It’s cross-platform, works on Mobile, beautifully designed and free. Donations are encouraged.