Libraries aren't just places for lending books, movies, and games to the public. They are importantly one of the few third places still available in most towns, alongside parks. Third places allow the public a place to gather and relax together at zero cost. Many have also branched out to lending expensive physical objects like tools, 3d printers, and such. Furthermore, librarians aren't just old ladies who check out books for kids. They are trained professionals who systematically arrange and assist researchers in finding information sources. Libraries store local news stories, public information, and vast quantities of other esoteric info long term, that you will never, ever find online. Do you need to find a map of the local area from a century ago? The Internet won't help you much with that. Librarians know exactly how to find that stuff. These days, searches just serve ads to buy stuff you don't need.

You can go online for your library as well but some things may not be available digitally for free that are on location.

not everyone can access internet

Not everything is available on the internet. It tends to bias towards recent publications.