what is the difference b/w system testing and functional testing

Functional Testing:
It is one of the testing type and related to functionality of systm or component that 'What it does'. It focuses on suitability,interoperability, security, accuracy and compliance.
System testing:
It is one of the test level and concerned with the behavior of the whole system/product as defined by the scope of a development project or product,it is process of testing an integrated system to verify that it meets specified requirements.sustem testing should investigate both functional and non-functional requirementsof the system.