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wrote:
PLS Explain me about

Almost all of this stuff is easily available on-line, if you spell
it right.
1.AES/EBC signal , How it work ,how it differance from the other

It's "AES/EBU" and describes a professional serial protocol
for communicating two-channel digital audio streams. It's
described in great detail in AES3-1985 and IEC 958.

2.SPDIF signal , How it work ,how it differance from the other

S/P-DIF stands for "Sony/Philips Digital Interface Format" and
is a consumer-grade serial protocol for commuicating digital
audio streams. It's described as well in IEC 958.

The two are very similar

3.XLR

XLR is a type of connector.

4.SDI signal

SDI is yet another serial protocol.