You can also use this app on Desktop and Mobile phone to access, download or delete those files which are already in Dropbox, and to add new files in to the drop box. If you want to the aforementioned activities on a Laptop/Desktop other than your home one. You can go to the site and access, download, delete and add files to your drop box.
You can use it's Mobile phone App, Desktop App and you can also use it from Drop box website, Download its Mobile Phone and Desktop Apps. Now after that you can use Drop box in the following ways:
There are some files which you want to access from any where. For example: scanned copies of your ID proofs, soft copy books, your passwords, Scanned rent receipts etc. Some times you want to transfer some files from your office PC to home Laptop and vice & versa.
Dropbox account is free and it includes 2GB of free space. I have been using the free one only and I would suggest that 2G space would be sufficient for most of us.
There are very heavy files which can not be sent in mail. For those files you can share a Drop box link with the person, whom you want to sent the file to. They will just click on the link, and the file will start downloading on their device.