Mycoplasma are a group of tiny bacteria that lack a cell wall, making them unique among prokaryotes. They are among the smallest known organisms capable of independent growth and reproduction. Mycoplasma can be found in various environments, including soil, water, and as part of the normal flora in humans and animals. Some species of Mycoplasma are pathogenic, meaning they can cause diseases in humans and animals. For example, Mycoplasma pneumoniae is known to cause respiratory infections, while other species can lead to issues in livestock. Their lack of a cell wall makes them resistant to certain antibiotics, complicating treatment options.