It fosters a trusting relationship. Active listening helps the other person to feel accepted and understood. Look the speaker in the eye. Focus your attention on this person without trying to do some other activity while listening. True, you may be able to do a task and hear what is said, but the speaker will feel unimportant, not heard, and discouraged.
Silence can be a powerful way to communicate acceptance and encouragement.
Im willing to wait as you gather your thoughts. I can let you say what youre thinking in your own way. You communicate impatience when you interrupt, do too much prodding or finish others sentences when they falter. Thats a sure way to hinder a relationship. Use questions sparingly.