What is use of pre-defined Schemas in SQL SERVER ?

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What is use of pre-defined Schemas in SQL SERVER ?

Hi All, 

I am having confusion and really don't know the purpose / Use of below pre-defined schema in SQL Server

db_accessadmin
db_backupoperator 
db_datareader
db_datawriter
db_ddladmin
db_denydatareader

more info...