Difference between d B, d Bi, d Bm and d Bd

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In this video, an overview of decibel scale is given At the end of this video, you will know What is Decibel(db) what is dBi what is dBm what is dBd What is difference between dB, dBi, dBm and dBD dBi is gain with reference to isotropic antenna and dBd is gain with reference to dipole antenna