FTP Transfer Mode

What transfer mode should I use - Binary or ASCII?

A transfer mode is the means of sending information from your PC to the server where your website is stored. FTP has two transfer modes: ASCII and Binary. ASCII mode is used to transfer text files such as Web pages, or CGI and Perl scripts. Binary mode is for transferring binary files, such as graphics, executable programs, or zip files. Most good FTP clients can tell what type of file you're trying to transfer and switch modes automatically. If you transfer files using the wrong mode you will not be able to view them on your website.