What does the Changeset mean in OSM full planet?

Hello! I got the Changeset information as shown below:

Does it mean that a user logged in and begin to edit an area, and then end edit the area? Thanks a lot!

You can display the objects involved by following this link:

The two timestamps “created_at” and “closed_at” show you beginning and end of this upload. “open” says that the user hast completed this action.