What is a one-sentence summary of the following article?
Minecraft Forge is an add-on to your official game that assists with complicated plug-in codes. You can download Minecraft Forge here: www.minecraftforge.net/forum/index.php?topic=16195.0.  As of now, Forge only supports Minecraft version 1.7.2. Minecraft Forge is completely safe as many Minecraft mod users support it. After downloading, install the Forge by simply clicking the installer.jar.  You need to open the installer.jar as Administrator. You must have an up-to-date Java in your laptop or computer; otherwise, you will encounter errors. If your Java cannot be detected by the installer, choose the default program, browse to your C:\Program Files\Java\jre#\bin, and then choose java.exe.

Summary:
Download the Forge. Install the Forge.