This document provides an overview of Scrum fundamentals including its values, principles, pillars, ceremonies, artifacts, and processes. It also introduces Large Scale Scrum (LeSS), which applies Scrum principles across larger organizations. The key Scrum ceremonies are Sprint Planning, Daily Standup, Sprint Review, and Sprint Retrospective. The main Scrum artifacts are the Product Backlog, Sprint Backlog, and shippable product increment. LeSS utilizes similar ceremonies but includes representatives from multiple teams to coordinate work across the entire system.