Dear Manjeet,
ISO 9000 family of standards is related with Quality Management Systems (QMS) and ensures that organisations have systems designed to meet the needs of their stakeholders and customers.
ISO 9001 deals with the requirements that organizations wishing to meet the standard have to fulfill.
For more information, have a look at
ISO - International Organization for Standardization and search for 9001:2008
Good Luck and Happy Researching!