You can view the documentation here: https://support.google.com/accounts/answer/185833?hl=en https://support.google.com/accounts/answer/185833?hl=en One key c

You can view the documentation here: https://support.google.com/accounts/answer/185833?hl=en https://support.google.com/accounts/answer/185833?hl=en One key caveat with these -- they grant access to your whole account, just like your real password. They don't give access to a specific scope (e.g. calendar) even through that might be all the application you're syncing needs.