Cydia, the jailbreak equivalent of Apple's App Store, indexes all jailbreak apps/tweaks/mods so that users can easily find them on the iPhone. To have Cydia on your iPhone, you must first jailbreak. This process frees you from having to only download apps from Apple's App Store. Once you jailbreak, you can install all kinds of cool apps, mods and tweaks on your iPhone through Cydia.
Instead of Apple's curated content, Cydia must rely on "repositories" from jailbreak developers to index jailbreak apps. These "repositories" (or "repos") are basically just storage houses for jailbreak content that developers want to distribute through Cydia. Repositories are sources that Cydia searches for jailbreak apps.
By default, Cydia already pre-installs some popular repositories that host most jailbreak content. However, there is a way in Cydia to add more sources. Not all jailbreak content can be accessed through the default sources that Cydia pre-installs. In this tutorial, I'll show you how to add a new source to expand your jailbreak catalog in Cydia...