An experience point is a unit of measurement that quantify the user's progression through the levels in SalesScreen.
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Experience points can be awarded by 

The level system consist of three important terms: level, rank and prestige. This is visualized here.
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​Level
A new user in SalesScreen start at level 0. Each level consist of 1000 XP, so to get from level 0 to level 1 you would need 1000 XP. Here is a few examples.

Level 0 ( 0 XP         ->  999 XP   )
Level 1  ( 1000 XP   ->  1999 XP  )
Level 2 ( 2000 XP  ->  2999 XP )
Level 9 ( 9000 XP  ->  9999 XP )

Rank
​A rank consist of 10 levels and has a name and picture related to it. For example:

Rank 1:   Private        ( Level 0    -> 9   )
Rank 2:  Specialist   ( Level 10   -> 19  )
Rank 3:  Corporal     ( Level 20  -> 29 )

Prestige
​Prestige mode begins after you have reach level 100. Then you go back to the first rank again, but you gain honor and glory, as well as a new rank image which proves you are in prestige.