Data transfer part

Question

I don’t quite understand which part of the code is used to transfer the data entered by the user to the database

Answer 1

$insert_sql="insert into user(username,password)values(? , ? )";

$stmt=mysqli_prepare($link,$insert_sql);

mysqli_stmt_bind_param($stmt,'ss',$name,$pwd);

$result_insert=mysqli_stmt_execute($stmt);