App Permissions Android 6. For example, an app might want permission to see your device contacts or location. While this is not available by default on the android 5.0, 5.1 and all lollipoo and older versions of android, there's a way around this to get ap.
Why would a calendar app need access to your microphone? This level of control seems more important now than. Thankfully, that mostly changed with the release of android 6.0 back in october 2015.
Sketchy app developers sneak in permissions they don't need.
If you ever feel an app is asking for too much access to your device you can always revoke it and as of android 6.0, you can individually manage app permissions for any app and revoke them selectively. Plus, you can edit which app is using. Using an application manager, you can view information and manage apps permission including storage, data usage, call logs, location, camera, microphone, etc. Features * list dangerous permissions which app requested.