Back in March last year, Microsoft announced that it will be ending support for Windows 7.
If you are still using that operating system, then you’ll have seen a popup from time to time, reminding you of the support ending one day.
Continuing to run Windows 7 will mean leaving your system vulnerable to new security threats.
Windows 7 is still a very popular OS, at least when judged based on number of users.
For the rest of us, if for whatever reason you still intend to keep a PC running Windows 7, the only way you can keep it safe is to keep it disconnected from the internet.