What is the other space on macbook pro?

I keep getting a notification saying that my startup disk is almost full. I checked storage and it has over 273GB worth of "other" memory storage. I rarely download movies, or music. I've erased all my documents that I don't use. What could be this huge "other" be? Any way to find out?

Any way to find out?
HD Space Checkers:
Disk Inventory X (FREE)
WhatSize (SHAREWARE)
OmniDiskSweeper (FREE)
GrandPerspective (FREE - donation)
Mac Performance Guide
Slimming your hard drive
Rule of thumb: You should never let your hard drive get to where you have only 10-15% of space left.

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    <Edited by Host>

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