Mods/Modloader

ModLoader was a type of mod manager and organizer created by Risugami (on the Minecraft Forums). It helps eliminate conflicts between mods: useful if you have many mods installed at the same time. Almost all mods required ModLoader in order to be used without problem. Coding to make mods work for ModLoader was a bit harder for beginners, which is why most newbie mods are not for ModLoader, although it is a very efficient program if you want to have mods. The ModLoader is NOT supported by Minecraft. 1.6.2 was the last version that was worked on and has now been replaced with Forge.

Setup

 * 1) Get the latest version of Forge from their website.
 * 2) Run the installer and keep install client checked.
 * 3) Wait for it to install and open the Minecraft Launcher.
 * 4) Select the Forge profile and start Minecraft.

Mods In Forge
First, you'll want to make a mods folder in the .minecraft folder of your computer. Then, I highly recommend getting your mods from curse.com. Next, place the .jar file in the mods folder. After That, your mods will automatically start running after you start Minecraft.

Block Launcher (MCPE)
Block Launcher is an app that acts like Forge but only processes JavaScript or .js files unless the mod is in .apk format, then it can be written in C++. To run mods in Minecraft Pocket Edition you must run Block Launcher rather than Pocket Edition itself.