Microsoft provides support for its software for a considerable period of time. Then it stops, bringing an end to the support services, bug fixes and security updates.
Microsoft made a commitment to provide 10 years of product support for Windows 7 when it was released on October 22nd 2009. In fact, the cut-off date is ever so slightly longer than that, with support for Windows 7 ending on January 14th 2020.
What to do if you're still running Windows 7 at IT Pro