How to enable gravatars in WordPress?

Gravatar stands for Globally Recognized Avatar. Users can set their avatars at https://gravatar.com/ and they will be displayed alongside their comments in any website that supports them.

Starting from WordPress 2.5, Gravatars are built-in and don't require any additional plugins for basic usage and management. You can manage your Gravatar from the Settings -> Discussion section of the WordPress admin panel.

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