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What are plasmids? describe their role in bacteria?

A plasmid is a small, circular, double-stranded DNA molecule that is distinct from a cell's chromosomal DNA. Plasmids naturally exist in bacterial cells, and they also occur in some eukaryotes. Often, the genes carried in plasmids provide bacteria with genetic advantages, such as antibiotic resistance.
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A plasmid is usually a circular (sometimes linear) piece of double-stranded DNA found in bacteria that is different from bacterium’s chromosome. It carries non-essential genes that can augment a bacterium’s ability to survive in certain circumstances.
For example, plasmids carry genes that enable a bacterium to metabolise a specific type of nutrient; otherwise, it cannot allow to conjugate. Plasmids are used for a vast variety of experiments from expressing human genes in bacterial cells to DNA sequencing.
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plasmid are the double stranded circular DNA which is mainly found in bacteria
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