what is CMM level 5

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i am a student of engenering,studied hard and now i am a employee of Cognizant Technology Solution, a CMM level 5 company.... "A very good company as it is cmm level 5 company"- my sir told me.so can any one please help me out with these 3 Questions: 1. What is CMM levels? 2. How many levels are there? 3. What is the heighest level?