The children ran around the tree.

In a circular or surrounding manner.
We walked around the park.
The cat jumped around the box.
Look around for your keys.
all around
around the corner
around town
about
surrounding
encircling
There are around twenty people at the party.

In a circular or surrounding manner, often used to indicate proximity or movement in relation to a specific point or area.
Walk around the park.
The cat is sleeping around.
Look around for your keys.
all around
around here
around town
about
near
nearby