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Covergroup is like a user defined type that encapsulates and specifies the coverage.  It can be defined in a package, module, program,  interface or class Once defined multiple instances can be created using new Parameters to new() enable customization of different  instances. A covergroup sepcification can include the following components

1. A clocking event that synchronizes the sampling of coverage points
2. A set of coverage points
3. Cross coverage between coverage points
4. Optional formal arguments
5. Coverage options

– Ref argument enables different variables to be sampled by different  instances of covergroup

Syntax :

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1.covergroup cg;

2.// Covearge points

3.endgroup : cg

4. 

5.// create instance

6.cg cg_inst = new;