What's the "other" files on mac?

Hey, i've been searching of ways to get my mac more space. When I look into: About this Mac > More info... > Storage, it says photos, musics etc and then it says "Other" and I have 253 GB there. What is this "Other"? How can I delete files in this category, to get more space free? I don't have an external hard drive, so i cannot simply drag my files to here. Please help, either with software, or any other way, any help will be appreciated.
Thanks,
joaopada

You should simply get an external HD to store media such as music, photographs and movies tend to occupy the most space with many users. Apple discusses this in three advice letters which I will note below.
However what is occupying the Other space on your HD, this is made up of a variety of data including OS X, other data files from apps you have installed, Apps themselves, your Trash, downloads etc...
If you want to inventory your system then download and install a tool like Disk Inventory. You can find DI at:
http://www.macupdate.com/app/mac/14393/disk-inventory-x
iPhoto: How to move the Library to an EHD
iTunes: How to move the library to an EHD
iMovie: How to move the Library to an EHD

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