Segmentation

In x86 systems, there may actually be 2 address translation steps:like this:

The major difference between paging and segmentation is that:

This is the main advantage of paging, since equal sized chunks make things more manageable by reducing memory fragmentation problems. See also:

Paging came after segmentation historically, and largely replaced it for the implementation of virtual memory in modern OSs.

Paging has become so much more popular that support for segmentation was dropped in x86-64 in 64-bit mode, the main mode of operation for new software, where it only exists in compatibility mode, which emulates IA-32.