Under the current system there are two types of CoS: Defined and Undefined . Choosing the right type is vital as if the wrong type is issued to an employee a sponsor could have their licence suspended or revoked as a result.
A Defined CoS should be used where the applicant is applying for a Skilled Worker visa and they are making their application from outside the UK.
An Undefined CoS should be used where the applicant is applying for a Skilled Worker visa from within the UK, or are applying for any other type of visa which requires a CoS.