TeamViewer is a popular remote support option due to its easy use for clients without technical experience. Windows Remote Assistance and Chrome Remote Desktop are viable options as well. Users looking for a more customizable option can consider various VNC software suites.
One of the primary advantages of TeamViewer is its simple interface for inexperienced users. After installing the programs, users looking for help can select an option to generate a one-time code that allows the person providing help to connect. After the user has finished working, the code is invalid.
Windows Remove Assistance comes with Professional and higher versions of Microsoft Windows, but it provides an easy way to connect to a remote computer. Chrome Remote Desktop works on any Windows PC that has the Chrome browser and appropriate extension installed. These programs require a bit more setup, but they're also free to use.
VNC is a protocol, and there are a number of programs that implement the standard in different ways. However, all require users to set up both a server and a client, which makes them more difficult than other options. In exchange for this complexity, users have more control over how the programs sends information and what access rights connecting users have. Users can, for example, use high compression rates to provide better performance over a slow connection or set up a user account with special privileges that only remote users can access.