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Verilog, standardized as IEEE 1364, is a hardware description language (HDL) used to model electronic systems.

It is most commonly used in the design and verification of digital circuits at the register-transfer level of abstraction.

It is also used in the verification of analog circuits and mixed-signal circuits, as well as in the design of genetic circuits.

Xilinx, Inc. is an American technology company, primarily a supplier of programmable logic devices.

It is known for inventing the field-programmable gate array (FPGA) and as the first semiconductor company with a fabless manufacturing model.

VHDL (VHSIC Hardware Description Language) is a hardware description language used in electronic design automation to describe digital and mixed-signal systems such as field-programmable gate arrays and integrated circuits.

VHDL can also be used as a general purpose parallel programming language.

In the semiconductor and electronic design industry, SystemVerilog is a combined hardware description language and hardware verification language based on extensions to Verilog.

SystemC is a set of C++ classes and macros which provide an event-driven simulation interface (see also discrete event simulation).

These facilities enable a designer to simulate concurrent processes, each described using plain C++ syntax.

SystemC processes can communicate in a simulated real-time environment, using signals of all the datatypes offered by C++, some additional ones offered by the SystemC library, as well as user defined.

In certain respects, SystemC deliberately mimics the hardware description languages VHDL and Verilog, but is more aptly described as a system-level modeling language.