FTP is the protocol that every single web hosting server uses out there to enable their subscribers and users to upload and download content from their servers. Servers are computers just like the one you have at home, but substantially more powerful and with a lot more space on your hard drive. The reason we have so much disk space if because there may be hundreds of users' web sites stored on that machine, each one of them has the ability to connect to the server and transfer files with an FTP client. When ever you connect to your web host to do the job on your website that you are using FTP, some people might be using SFTP, but probably will not be aware of it. In either case, you will be using a form of FTP!
FTP Client are simply programs that allow you to use all the available commands for the FTP protocol, such as upload, download, move, rename and many more. Of course you can do this manually without the use of a GUI (Graphical User Interface), which is what the commercial FTP clients provide as buttons and menus. manual methods often involve a command line interface where the user types commands directly to the FTP, telling servers exactly what to do. For most people, this would take a long time to learn and very probably not worth learning it, if only want to upload or download files odd! The FTP client-based graphical remove all the complexities giving simple buttons to click on that run complicated commands for you. A new generation of FTP convenience has dawned upon us, and that comes in the form of web based FTP client. These are simply the online interfaces or small programs that allow you to access the ftp / web server to a web site. If you are going to use this kind of service to make sure that the site hosting the web based FTP client is trustworthy, because you need to enter your login credentials to access your FTP space. If it is a malicious website, it is very easy for them to steal information from you!
public FTP servers allow you to access them without user credentials what so ever and it is considered an anonymous user. Paid web hosting and FTP hosting services do not allow anonymous logins, as they are obviously a serious security breach! Even if they are allowed anonymous access, an anonymous user will not be able to do any file operation what so ever. They are simply allowed to view the contents of only the server. The concept of anonymous user access is in decline because it is becoming increasingly unnecessary, as well as a security risk, so most administrators do not allow it. enterprise servers and servers that contain sensitive information most likely use SFTP (Secure File Transfer Protocol), rather than only FTP (or at least should!), because all the instructions and information activities is private matter and not visible from the public or than anyone else. Such information can be used by some individuals of resources to break passwords and perform a whole series of other harmful activities.
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