What is a codec?

either hardware or software app which encodes and decodes digital data stream and or data, in AV industry codec is mainly used for video conferencing application. 

A codec is a device or computer program capable of encoding or decoding a digital data stream or signal.

Codec- Is a device or program that compresses data to enable faster transmission and decompresses received data.

CODEC is two or more video and audio transmissions like a videoconferencing

A codec is a piece of equipment or software that employs a computer algorithm, or a set of procedures, to encode or decode file information. There are different types of codecs that are specialized for different purposes, including audio codecs and video codecs. A codec encodes a data stream for transmission, storage, or encryption, or it decodes a data stream for playback or editing.

A codec is a device or a software used to encode or decode, an analogue signal to a digital data stream, while transmitting or receiving the signal, respectively.

Codec is a software  for playback of music and video files. The program that compresses data to enable faster transmission and decompresses received data.

CODEC is a program or device for encoding or decoding data for faster data transmission

It is either a hardware or software to encodes and decodes data stream of audio