A proxy server acts as an intermediary, concepts vary based on whether it's a forward proxy (client-side) or a reverse proxy (server-side). To build one, choose a programming language like Python or Node.js and design it to handle requests for caching, security, or load balancing. Deployment involves setting it up on a server and configuring clients or servers to use it, ensuring it meets your specific requirements for performance, security, and privacy. Definition and concept idea Forward Proxy: Sits in front of clients and forwards their requests to the internet. Purpose: Client anonymity, content filtering, and client-side caching to speed up access and save bandwidth. Interaction: Clients are aware of the proxy and are configured to use it. Reverse Proxy: Sits in front of servers and handles requests on their behalf. Purpose: Protects backend servers by hiding their identity, provides security features like SSL termination, and performs server-side caching. Interaction: Client...