They are different languages for Hardware design and
verification.
For more information on..................
Systemverilog tutorial
Systemverilog randomization tutorial
Systemverilog DPI tutorial
Systemverilog Assertions tutorial
Openvera tutorial
Verification Concepts.
Verilog tutorial
VMM tutorial
RVM tutorial
AVM tutorial
OVM tutorial
Verilog interview questions
Specman interview questions
Systemverilog interview questions
OpenVera Interview questions