Wireshark does not display the preamble field of a frame header . what does the preamble contain?

The preamble in a frame header, particularly in Ethernet frames, is a sequence of bits that serves to synchronize the sender and receiver. It typically consists of 7 bytes of alternating 1s and 0s, followed by a 1-byte Start Frame Delimiter (SFD) that indicates the start of the actual frame data. This synchronization allows the receiving device to correctly interpret the incoming data by establishing timing and ensuring that it is ready to process the frame. Wireshark does not display the preamble because it is not part of the actual frame data that is transmitted over the network.