A mod APK is an application that has been modified https://apkgenk.com/ so that it works with Android devices. These modified apps do not have security checks, so they can cause problems for your device. They also take away revenue from the original developers. Because of these risks, you should not download MODDED apps. They can also damage the reputation of the original APK.
Mod APKs are also not illegal. While they don't have the same features as the original APK, they are often more reliable and have additional features that the original applications may not offer. For example, a Mod APK may include infinite game currencies, extra support, unlimited resources, and free access to paid versions.
Mods can also have malicious code installed. Some of these code aims to steal personal information, so you should be careful with the type of app you download. You may want to stick to trusted sites. Most reputable developers will make sure that their application is safe. A malicious APK may contain malware or spyware that can damage your phone.