What is the wildcard masks and ACLs

Hellow friend today we will learn about the wildcard masks and ACLs in computer networking.

(What are ACLs)
ACLs are a set of rules used most commonly to filter network traffic. They are used on network devices with packets filtering capatibilites like routers or firewalls. ACLs are applied on the interface basis to packets leaving or entering an interface.

(What is wildcard masks)

Wildcard masks are used to specify a range of network addresses. They are commonly used with routing protocols (like ospf) and access lists.
Like a subnetmask, a wildcard mask is 32 bits long. it acts as an inverted subnet masks, but with wildcard mask, the zero bits indicate that the corresponding bit position must match the same bit position in the IP address. The one bits indicate that the corresponding bit position does not have to match the bit position in the ip address. So this is all about the wildcard masks and ACLs.