Our brains are naturally configured to process sound from two ears. This is called binaural hearing. Hearing with only one ear is much harder for us to do.
People who listen with both ears can tell intuitively where sounds are coming from. They instinctively identify which sounds are important and which can safely be ignored. As a result, they feel less vulnerable and more in control than those who hear with just one ear.
Binaural hearing is also important to help people hear in noisy conditions, such as listening to the teacher in the classroom, or having a conversation in a busy office. Hearing with two ears is how the brain separates the sounds you want, from ones you don’t.