In electronics and telecommunications, jitter is the deviation from true periodicity of a presumably periodic signal, often in relation to a reference clock signal.

In clock recovery applications it is called timing jitter.

Jitter is a significant, and usually undesired, factor in the design of almost all communications links.

Packet loss occurs when one or more packets of data travelling across a computer network fail to reach their destination.

Packet loss is typically caused by network congestion.

Packet loss is measured as a percentage of packets lost with respect to packets sent.

The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.

It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, wireless, and optical networking technologies.

The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and peer-to-peer networks for file sharing.

Computer software, or simply software, is that part of a computer system that consists of data or computer instructions, in contrast to the physical hardware from which the system is built.

In computer science and software engineering, computer software is all information processed by computer systems, programs and data.

Computer software includes computer programs, libraries and related non-executable data, such as online documentation or digital media.

Computer hardware and software require each other and neither can be realistically used on its own.

In online gaming, lag is a noticeable delay between the action of players and the reaction of the server in a video game.