An APK (Android Package Kit) is the file format used to distribute and install applications on Android devices. It contains all necessary components, including code, resources, and certificates, required for an app to function. APKs allow users to install apps manually without using the Google Play Store, making them useful for early releases, region-restricted apps, or older versions. However, downloading APKs from untrusted sources can expose devices to malware or security threats. To ensure safety, always download APK files from official or verified sources before installation.
