Account Delegation in Gmail lets you designate grantees who can access a Gmail account you have the credentials for.
After accepting the delegation invite, the grantees can click their user icon in the top right of Gmail and switch to the shared Gmail account without needing the shared account credentials.
If you are a grantee, you cannot add additional grantees unless you sign in to the shared account with the shared account credentials. This is most easily accomplished in a Private/Incognito Window.
Account Delegation in Calendar lets you share a calendar you have Manage Sharing rights on.
If you share such a calendar with the Make changes & manage sharing permission, the grantee will see the shared calendar under "My calendars" in Google Calendar, and will be able to interact with events on that calendar as the owner of the shared calendar.
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