What is meant by sideloading in mobile applications?

Sideloading in mobile applications refers specifically to the practice of installing an app from a source that is not the official app store or repository associated with the device's operating system. This common practice allows users to bypass the standard application distribution platforms, which can include Apple's App Store or Google Play Store. By sideloading, users can install applications that may not be available in the official stores, often because they are in development, not approved by the platform, or intended for a specific purpose or audience.

This practice can be useful for developers testing their applications or for users who want to access apps that provide functionality not available through official channels. However, it also carries security risks, as apps sourced from unofficial channels are not subject to the same review and security vetting processes, increasing the potential for malware or non-compliant applications.

The other options reflect different functions unrelated to sideloading. Running multiple apps simultaneously pertains to multitasking capabilities of a device; updating apps through wireless connections refers to how applications receive updates, generally through official stores; and deleting unnecessary apps involves managing storage and applications on a device but does not relate to the installation of software at all.