Some are still using bitcoin core but many people prefer to use non-custodial wallet which doesn't need to download whole blockchain which takes up a lot of space. There are wallets you can use like electrum, trustwallet and many more wallet that are non-custodial.
It would be nice if you'd start by learning what custodial wallet means.
Hint 1: it's not about downloading blockchain or not
Hint 2: Bitcoin Core is not custodial