This is the 876th most frequent Chinese word.
一边
"Doing two actions simultaneously; on one side."
The term '一边' shows that walking and chatting are done concurrently and in a habitual manner.
他们喜欢一边散步，一边聊天。
They like to walk while chatting.
Here, '一边' is used to describe the multitasking of listening to music and doing homework.
我一边听音乐，一边完成作业。
I complete my homework while listening to music.
The word '一边' is used to indicate that two actions are happening simultaneously, in this case eating and reading.