There are many types of submission, but the most common are verbal, written, and physical.
Verbal submission is when someone uses words to surrender or give in to another person. This can be done verbally, through text message, or even over email. It is important to be clear when submitting verbally, as there can be miscommunication otherwise.
Written submission is when someone submits by writing something down. This could be a contract, an online form, or even a note left for someone else. Written submission is often more formal than verbal submission, and it can be used as legal evidence if needed.
Physical submission is when someone physically surrenders to another person. This could happen in a fight, during sex, or even during a game of chess. Physical submission usually involves some type of body language that shows the submissive person is yielding to the other person.