Dictionary of computer terms may help you with your definitions.

 

21. files vs. folders/directories - A file is a collection of data, analogous to a book or a magazine. A folder or a directory can contain many files, analogous to a bookshelf or a filing cabinet. Files contain information, while folders just help keep files organized. Directory is another name for folder.
22. floppy disk - A floppy disk is used to store computer data and can be removed to be easily transported to another computer. The two main types of floppy disks are 5-1/4" and 3-1/2"floppies. 5-1/4" (pronounced "five and a quarter inch") floppies contain about 800kB of data on a thin, flexible disc inside a 5-1/4" square, flexible plastic sleeve. 3-1/2" (pronounced "three and a half inch") floppies are smaller, but contain more information: 1.44MB of data on a flexible disc inside a hard plastic enclosure measuring about 3-1/4" square by 1/8" thick.
23. freeware - Freeware is software that can be downloaded, installed and used for free.
24. FTP - FTP stands for File Transfer Protocol and it is a way to serve files over a network for people to download.
25. GIFs vs. JPEGs - These are both file formats used for images on the Internet. Both file formats are ideal for web images because they can compress the image into a smaller file size than other image formats like BMP or PICT. The GIF file format is used for images with few colors and for animations. GIF stands for Graphics Interchange Format. The JPEG format is best used for photographs or other images that have many shades of color. JPEG stands for Joint Photographic Experts Group.
26. graphic file - A graphic file is a file that contains a drawing, photograph or other image.
27. hacker - A hacker is one who really excels at computer programming, often finding creative solutions to tricky programming challenges (the solution is often known as a "hack"). The term hacker is also used in a negative light to describe someone who uses their programming skill for illegal purposes, such as to breaking into unauthorized computer systems (another term for breaking into a computer system is "hacking").
28. hard copy, printout - A hard copy of a file is something you can hold in your hand, such as a piece of paper, as opposed to an electronic computer file that exists only as bits within the computer.
29. hard disk drive - A hard disk drive is a mechanical device used to store large quantities of information. A hard drive stores its information permanently even when the computer is turned off. Information is only lost when it is intentionally deleted or erased, or when the hard drive fails, which is known as a hard drive crash. Although most hard drives are quite reliable, it is always a good idea to backup a hard drive in case of a crash.
30. hardware - Hardware is a term generally applied to electronic or computer equipment, but can also be applied to the physical pieces (nuts, bolts, metal, plastic, etc.) of any device or piece of machinery.