In case you would like to send large files like videos, high quality large size photos or mp3 songs to your friends, the most popular email services such as Hotmail, Gmail, and Yahoomail only let you to add file attachments upto few MegaBytes (usually 20MBs something), so it is not possible for you to send large files using these regular email services.
TransferBigFiles gives unlimited amount of space for you to store your files on their servers, with the requirements that each time you can only send up to 5 files and 1 Gigabyte per time currently. A download link will be sent to a recipient to the download page after that. You will also be notified when your files are being downloaded by the recipient. With its advanced options, you can include a message to the recipient and have password protect access to the file(s) for security purpose.