Compressed

Unit 78 

File Exercise

a string of characters attached to a filename, usually preceded by a full stop and indicating the format of the file.Theses can be used to show what type of file the document is E.G PSD for Photoshop.


Some of these files are different for space and such, Some times it better to use a Compressed File instead of a uncompressed file.

Compressed

Compressed is where you take a file and compress it down into a ZIP file to save space.

What is a ZIP File?

ZIP is an archive file format that supports lossless data compression. A .ZIP file may contain one or more files or directories that may have been compressed. The .ZIP file format permits a number of compression algorithms, though DEFLATE is the most common.

ZIP isn't a Document its a Folder. To unlock a ZIP file you would need a third party App Called "7ZIP" Which uncompressed the folder with the files inside.

Optimising

To optimise means to make the best or most effective use of a file and maximising the space that you can use .

For E.G One of these are compression and the other isn't they look the same since its a basic photo but the size difference is quite large to save space.