ICC Profiles

ICC is the abbreviation of International Colour Consortium. These profiles usage is to display the proper colours of a file. Basically it is the colour ID of a device.

An ICC profile will keep information such as how many colours the device can display and if the colours are provided in the way they should be. These profiles are obtained after a calibration of the device is done. 

ICC Profiles

 If the device used is not calibrated, therefore it doesn't have its own ICC Profile, the colour values are going to be different then they are supposed to be. But if the device is calibrated thanks to the ICC profile that would be created, the colour values will be the same as it is supposed.

Calibration vs Non Calibration

Reference:

http://www.color-management-guide.com/icc-profiles.html