An HTTP proxy is a type of proxy server that supports the HTTP protocol, enabling clients to access blocked websites by communicating with the server through the proxy. In contrast, an HTTPS proxy supports the HTTPS protocol, which provides a more secure communication method to protect data during transmission from theft or tampering. Therefore, HTTP proxies primarily aim to achieve network access transparency, while HTTPS proxies focus on data security. When selecting a proxy, it is essential to choose one that meets your specific needs.