LOg cache question

Hi all,

As we know log file will not contain the pages, It contains the series of log records.

I have couple of doubts here

1) in SQL server memory pool LOG CACHE is for Transaction LOG FILE??

2) If so Then

"Log Caches: This is the pool of memory used to read and writelog pages."

Here what LOG pages are doing??

Kindly help me in understanding this.

Thanks in advance