Interuptions in the flow of a network game caused by modem or network difficulties/traffic. It can appear as short burpp, slowed down game play or in the worst case a frozen screen. All computers and connections suffer from lag occassionally, but the faster your computer and internet connection the less lag you and other players will experience. Lag is also known as 'latency': the inevitable slow-down of the internet when the client computer communicates to the host computer or vice versa. Usually experienced by 56k or 28k modem players. Can sometimes be affected by the processor speed of the computers, but usually caused by network (internet) communication delays. (measured by 'ping' times which are measured in milliseconds ###ms).