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. wikipedia.org

Verilog is a hardware description language (HDL) used to model electronic systems. Verilog HDL is most commonly used in the design, verification, and implementation of digital logic chips at the register-transfer level of abstraction. wikipedia.org

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. wikipedia.org