Microsoft abandoned Windows XP some months ago and while some users moved on to other operating systems, others are still running windows XP.

The main issue here is that Microsoft won't release official security patches for the operating system anymore which leaves it vulnerable to exploits discovered after end of support.

There is a way to get security updates still, but those are not designed for XP but for POS systems that are still supported by Microsoft until 2019. While based on the same core, it is more of a last resort for users who cannot switch to another operating system.