The proxy gateway functions as a kind of middleman between a client and web servers.

[Excanty]

A proxy gateway serves as a kind of gateway connecting a client and target websites.
If a user connects through a proxy, the traffic go to the intermediary initially, and subsequently the service forwards your data to the final recipient for you.
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Such a setup helps to mask your real IP address, get around regional blocks, and improve security.
However, many proxies are not secure, so one should pick a credible provider.