Explain precisely following abbreviations: UDP, FDM, ABR,EFCI,AIMD,MSS

UDP: User Datagram Protocol - A communication protocol that allows for the transmission of data over the internet. Unlike TCP, it does not guarantee the delivery of data and does not establish a connection between the sender and receiver.

FDM: Frequency Division Multiplexing - A method of transmitting multiple signals over a single communication channel by dividing the channel into multiple frequency bands, each of which is used to transmit a separate signal.

ABR: Available Bit Rate - A type of service in ATM (Asynchronous Transfer Mode) networks that allows for the dynamic allocation of bandwidth based on network congestion. ABR service aims to minimize delay and maximize network efficiency.

EFCI: Explicit Forward Congestion Indication - A mechanism used in ATM networks to signal congestion to network users. When network congestion occurs, the network sends EFCI signals to inform users to reduce their transmission rates.

AIMD: Additive Increase Multiplicative Decrease - A congestion control algorithm used in TCP (Transmission Control Protocol) networks to regulate network traffic. It increases the transmission rate until congestion occurs and then decreases the rate exponentially to avoid network congestion.

MSS: Maximum Segment Size - The largest amount of data that can be transmitted in a single TCP segment. It is determined by the maximum transmission unit (MTU) of the network, which is the largest size of data that can be transmitted over the network without fragmentation.