Microsoft has just ended support for Internet Explorer versions 10 and earlier. That means Microsoft will no longer provide security patches, which makes them risky to use from a security perspective.
Anyone still using those versions should update to IE 11 immediately. Those using Windows 10 can use the Edge browser instead. Edge works well, but unfortunately does not yet support add-ons like password managers. Another option is of course to use Chrome.
If there is a need to use an earlier version of IE because of legacy internet applications that are not up to current standards, IE 11 includes an “enterprise mode” that will run those.
And if you are still using Windows 8 or an earlier operating system, it’s time to upgrade to at least 8.1. Security support is still available, but not full support. Windows 10 is the best option. For most, that upgrade is free. If you are still using Windows XP – yes, some still are – its way past the time to upgrade – its not even getting security support anymore, and is a potential security risk.