Generally, suppose you have a swarm of honey bees gathered on a bush, a wall or somewhere similar. In that case, this is because they are resting or they’re gathering their numbers as they’re looking for a new home.
Usually, within a day or a few hours, the Swarm will disappear. However, you could look for a local beekeeper who will be able to give you some guidance.
In the summer months, honey bees split the existing colonies to start a new Hive in a different location. They take supplies of pollen and honey, which they need to begin their new hive.