What is the wp-includes/certificates/ca-bundle.crt used for?

ca-bundle.crt File

It is an SSL Certificate file which WordPress uses as default for secure connections (https) when WordPress make request using HTTP API

This file is used in /wp-includes/class-http.php file. It is a WordPress default file (never remove anything from WP core!) so removing it will cause problem for the class to work properly.

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