Your trusted Certificate Authorities (CAs) are the organizations that you trust to guarantee the signatures of your encrypted traffic and content.

What are trusted certificates in Android?

Trusted secure certificates are used when connecting to secure resources from the Android operating system. These certificates are encrypted on the device and may be used for Virtual Private Networks, Wi-Fi and ad-hoc networks, Exchange servers, or other applications found in the device.

What happen if I clear trusted credentials on my Android phone?

You would usually remove a certificate if you no longer trust a source. Removing all credentials will delete both the certificate you installed and those added by your device. Go to your device Settings.