Error when trying to update Craft

I’m pretty new to CraftCMS and am trying to install updates for a client. I am getting this error and I don’t really know what it means. Any help of brief explanation for this would be appreciated.

Error: The "https://asset-packagist.org/packages.json" file could not
be downloaded: allow_url_fopen must be enabled in php.ini (https://
wrapper is disabled in the server configuration by allow_url_fopen=0
failed to open stream: no suitable wrapper could be found) Output:
Loading composer repositories with package information.