Difficulty

Write the first paragraph of your article here.

Introduction
Every singleplayer game has a difficulty setting, ussualy easy,normal and hard. The higher you set the difficulty the harder it is to kill a mob or it will take less shots to kill you.

Red Dead Redemption specific
Casual mode gives you a full auto-aim system (and faster regenerating health). Normal mode features snap-to-target with precise aiming using the right stick. Expert mode implements free aim with no lock-on at all.

Source: R* newswire Q&A