Give differences: $BOD$ and $COD$.

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$BOD$$COD$
$(1)$ $BOD$ stands for Biochemical Oxygen Demand.$(1)$ $COD$ stands for Chemical Oxygen Demand.
$(2)$ It is a test used to measure the concentration of biodegradable organic matter present in a water sample.$(2)$ It is a test used to indirectly measure the total amount of organic compounds (both biodegradable and non-biodegradable) in water.
$(3)$ Micro-organisms such as bacteria are used as biological oxidizing agents.$(3)$ Strong chemical oxidants such as potassium dichromate are used.

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