Is It All Client Side, or Client Side?

Almost all front and code is client side, but you can also have some backon stuff on the client side. And i's it's run locally, like the cline side means that it's run locally under a computer oron the users computer or phone. But for sure, if you work them in any work that requires permanence, or working with multiple clients, that is thuser can jump from their phone thro lap op orditeneter phone....