Difference between a page and a segment?

Paging is a virtual memory scheme which is transparent to the program at the application level and which divides memory into fixed-size blocks, such as 4 KBytes.

The segmentation memory management scheme imposes a greater book-keeping burden on the application, and refers to memory using segments of variable size.

segmentation is a logical unit visible to the user's program and id of arbitary size whereas paging is a physical unit invisible to the user's view and is of fixed size