Bacterial DNA is the genetic material found in bacteria, which are single-celled microorganisms. Unlike the DNA in more complex organisms, bacterial DNA is typically circular and not enclosed within a nucleus. This structure allows bacteria to replicate quickly and adapt to their environments efficiently. In addition to their main circular DNA, bacteria often contain small, circular pieces of DNA called plasmids. These plasmids can carry genes that provide advantages, such as antibiotic resistance. Bacterial DNA plays a crucial role in the reproduction and survival of bacteria, influencing their traits and behaviors.