This white paper explores the concept of Link Aggregation Groups (LAG) and its significant role in optimizing network performance and providing high availability in modern network infrastructures. Delving into how link aggregation advantages of load balancing, fault tolerance and seamless failover, help improve network resiliency and minimize potential points of failure. Furthermore, it presents recently standardized link aggregation enhancements including Per-Service Frame Distribution (PSFD) and Multi-Chassis LAG (MC-LAG) by exploring real-world use cases.