Difference between the methods .pipe() and .subscribe() on a RXJS observable

I recently notice that I can return a value inside .pipe() but not inside .subscribe().

What is the difference between these two methods?

For example if I have this function, let's call it 'deposit', which is supposed to return the account balance, if I do this:

deposit(account, amount){
return this.http.get('url')
.subscribe(res => {
return res;
}
}


It returns an observable and if I do this:

deposit(account, amount){
return this.http.get('url')
.pipe(
map(res => {
return res;
});
);
}


It returns the account balance as expected.

So why?

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