but the most important part is that it extracts information from your account/s by logging in.
To avoid the however-unlikely risk of the service being compromised and someone nefarious having access to your money, you are best advised to set up a view-only account.
With FNB it's a few steps, as outlined below (YMMV with other banks) in a picture story.
|Login and select Online Banking Settings|
|View Secondary Users|
|Add User, giving an appropriate Name|
|Fill out the information|