There are two types of contacts, directory contacts which come from your organization, and local contacts which you can add from scratch to your copy of Teams.
Directory contacts have some fields set by your organization, and additional fields which can be edited by you.
Local contacts are stored within your local copy of Teams, and do not synch with an organization’s directory.
If your company has a directory set up, you'll be able to see information about your colleagues without saving them as contacts. You can search for them in Search in Teams or select their picture in Chats or Channels.
If you want to add other information or to see your colleagues as part of your contact list, you can save them to your contacts by selecting their name in directory search during contact creation.
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