Just found this site, it’s very useful imo. If you are a student this will help a lot. I used to carry a flash drive and I’ve lost some but I have dropbox on my laptop and my desktop and all my school files are in one place. It is essentially a folder you can have on any computer you use and can be accessed on any computer with internet, as well as your iPhone. When you download the program, it puts a folder anywhere you want it and you just save files to it, or drag and drop and it gets automatically uploaded to the online folder and you have access to it just like any file on your computer.
Here is a video of it in action:
Sign up through my referral and we both get an extra 250MB! (free acct is 2gb, refer friends for up to 8gb, there is also a paid version)