What is the essence and biological meaning of the process of spore formation in bacteria?

What is the essence and biological meaning of the process of spore formation in bacteria?  How are bacterial spores different from plant spores?Bacteria are characterized by spore formation. Disputes arise, as a rule, under adverse conditions, when there is a lack of nutrients or when metabolic products accumulate in excess in the environment. Spore formation begins with the fact that the cell loses part of the water and part of the cytoplasm is isolated inside it. This part contains circular DNA and is surrounded by a membrane and a thick cell wall. Bacterial spores are very resistant. In the dry state, they remain viable for many hundreds and even thousands of years, withstanding sharp fluctuations in temperature. With the onset of favorable conditions, the spore gives rise to a new bacterial cell.
It should be remembered that bacterial spores, unlike fungi and plants, do not serve for reproduction, but for experiencing adverse conditions.

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