In a licensed playgroup, children move between free play, a story, a craft, and songs. Adults set out supplies at child height. They sit on the floor and join in. Parents stay with their child or step back and watch. A typical session runs about an hour. Children choose what to try. No child is pushed to share or sit still.
At home, the benefits show up in small ways. Your child hums a song from story time, or asks for the same craft again. They are more comfortable in a group and more willing to try something new. You meet other families who live nearby, and you have a place to go on a weekday that costs nothing and lasts about an hour.