A psychiatric institution is a special kind of hospital where people who have issues with their emotions, thoughts or behavior go to get help.
Just like if you have a stomach ache or a broken bone, you can go to a regular hospital to get better. But, if your feelings or thoughts are making you feel sad, angry, scared or confused, sometimes you need to go somewhere special where people are trained to help you feel better.
At a psychiatric institution, there are special doctors and therapists who know a lot about how the brain works and how to help people who are having a hard time.
When you go to a psychiatric institution, you might stay there for a little while so that the doctors and therapists can work with you to help you feel better. While you're there, you might take part in different activities like art or music therapy, talking with a therapist or counselor, taking medication and going to different classes that help you learn skills to cope with your emotions or thoughts.
It's important to know that going to a psychiatric institution doesn't mean that you're "crazy" or that there's something wrong with you. Just like any other kind of hospital, it's a place where people go to get the help they need to get better.