What are the differences between a proxy host and a proxy port?

Proxy host: proxy host, also known as proxy server. A proxy server is a computer on the web that redirects your web browsing activity. A server provides services, and an agent is a program that performs tasks on behalf of another program or computer. The proxy server represents another server. The proxy server host is the computer running the proxy server.

Port: the connection between two computers / interfaces or more using ports is more like a door through which IP addresses pass.