Why there is a class division in IP addressing?

Class division in IP addressing was established to efficiently allocate and manage the limited number of available IP addresses. The division into classes (A, B, C, D, and E) allows for different network sizes and types, making it easier for organizations to choose an address scheme that fits their needs. Class A supports large networks, while Class C is more suited for smaller networks. This hierarchical structure simplifies routing and network management, although it has become less relevant with the advent of CIDR (Classless Inter-Domain Routing).