In relation to the first four levels of the OSI model, PDU is an important concept. PDU is a bit in Layer 1, a frame in Layer 2, a packet in Layer 3, and a segment in Layer 4.
A Protocol Data Unit is the name for the information contained in each layer (PDU). It also has control information unique to the protocol along with the data. As a PDU goes across the layers, each one will add (or remove) information about its protocol. Each layer's PDU is assigned a unique name to reflect its function. In a computer network, it therefore refers to a block of data that is exchanged between network end systems.
Due to its variation in layer-specific protocols and norms, it is utilised for the Open System Interconnection (OSI) paradigm, as its name suggests. There are various sorts of data to be exchanged between the various layers of a protocol stack. When using TCP (Transmission Control Protocol), the PDU of the Transport Layer is referred to as a segment, and when using UDP (User Datagram Protocol), the PDU is referred to as a datagram.
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