Windows Update is the software developer by Microsoft to constantly give updates to the operative systems that they provide to their users. The main intentions of Windows Update are to improve the overall stability and aim to cover the necessities of their customers as well as fixing any recently discovered vulnerabilities in order to protect the users from possible evil hackers and different types of malware or viruses.
The best feature about Windows Update is that you can change the dates of the updates, and even pause them temporally by 7 days in some of the last Windows 10 updates.
It’s often advised to let your laptop or tablet loading if you receive an update screen once you start it, because even if most updates usually won’t take longer than 30 minutes, some can take more than 1 hour and in some specific cases, even more than 2 hours.
Is possible that you experience some error sometimes after installing an update, in that case is recommended to visit the Windows Update settings and manually look for updates, it will usually fix the problem. In some situations you might have to go into Start > Settings > Update & Security > Troubleshoot to get your last update properly working.
Updates are downloaded in the background and the speed of your connection influences the download speed as well.
Everytime you get an update installed, you can check the history by going into Settings > Update and Security > Windows Update > View update history
Usually the biggest updates are called “Feature updates” and they are done 2 or 3 times per year. They often include new functions and capabilities, and are highly focused on security as well.
Constant updates can be annoying sometimes but don´t forget evil hackers around the Internet are constantly looking for new victims and you could be the next one. Keep yourself safe by updating your Windows snapshot to the latest version available!
On the Windows Update FAQ we can get more information regarding the topic: