Network Access Control List (NACL):
A NACL is a stateless firewall that controls traffic entering and leaving a subnet. It acts as a first line of defense for the associated subnet.
Analogy: Imagine NACLs as security guards at the entrance of each floor (subnet) in your office building (VPC), inspecting incoming and outgoing traffic based on a set of rules.
Why It Matters: NACLs provide an extra layer of security by allowing you to define rules that filter traffic based on IP addresses, ports, and protocols, adding an extra layer of protection at the subnet level.