Remote login allows users to access and control a remote computer over a network connection. It involves installing desktop sharing software on both the host and client computers. The client software connects the user's keyboard and display to the host computer, allowing them to interact with it remotely. Desktop sharing works by encrypting and transmitting packets of information about the host's screen to the client. Remote login is commonly used for remote technical support and real-time collaboration between coworkers in different locations. While convenient, it also presents security risks that require the use of secure protocols like SSH.