Sideloading is the term used to describe the process of installing applications directly on an iPhone, instead of using the App Store. It's not a common practice, but it is possible. By downloading apps from alternative sources, you are bypassing the security measures put in place by Apple. It is important to be very careful when downloading apps from outside sources, and to thoroughly research the background of both the app and its developer.
In general, it is best to only download apps from outside of the App Store if there is a very good reason for doing so. If you are considering downloading an app from an alternative source, it is important to do your research and make sure that it is safe to do so. The easiest way to add applications to your iPhone without using the App Store is through a process called sideloading. Apple has always been very strict with its App Store policies, and any app that violates these policies will be removed.
If you are an iOS user, there may be times when you want to download an app that isn't available on the App Store. Once you have jailbroken your device, you can install almost any app you like, including apps that change the appearance of your interface, give you easier access to your file system, allow you to run multiple apps at once, and much more. Jailbreaking your device also allows you to download paid apps for free, without using the App Store. The main advantage of jailbreaking your device is that it gives you access to alternative app stores and allows you to install any app you want, as well as access the main iOS files.
In Android 11, the process has changed slightly so that after downloading an app, you will need to restart it before giving it permission to run. Another way to install apps that aren't available on the App Store is through a program called TestFlight. This program allows developers to test their apps before submitting them for review on the App Store. It also allows users to install apps that have been removed from the App Store due to policy violations, malware or malfunctions.
While Apple has been criticized in the past for how it enforces its guidelines, these measures generally make apps available on the App Store safer and more reliable. Finally, there are also third-party app stores like Tutu Helper which allow users to download apps that aren't compatible with Apple without having to jailbreak their device.