Hello, gibsonrocker800.
Look at this example:
If you are asked to read a book and someone only gives you one page at a time to read then it will take a while to do so. (no buffer) If you are given the book (buffer), then you can read at your own pace, and you do not have to wait for the pages to arrive. (lets say from your your hard drive) So, the BufferedWriter is used to increase speed.
Hope this helps.
