Segments and Offsets

I think I am understanding them now but I am not sure.
Is this the correct definition of Segment:Offset:


The memory is divided into different segments(like when TCP/IP segments your data,using the transport layer, before sending it over the network). Each segment has its own address in the memory (EG:0B20h).
An offset is located in a segment. It also has its own memory address but it start from the segment (EG: 0B20h:00000h) would be the location at the start of the given segment.

Your program is divided into different segments, code, stack, and data. An offset is some value that you are to move from some position.