What is approximately one billion bytes?

What is approximately one billion bytes?
This is approximately one gigabyte. In reality, one gigabyte is 1024 MB which gives approximately 1 073 741 824 bytes, but especially when purchasing storage media, one billion bytes is one gigabyte.
If you are looking for something more general, bytes are a method of storing computer information (which is effectively just one's and zero's) and a byte is a very small measure whereas a gigabyte is relatively large with average USB drives being approximately 8 gigabytes.