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Bacteria also live in symbiotic and parasitic relationships with plants and animals.

The famous notion that bacterial cells in the human body outnumber human cells by a factor of 10:1 has been debunked.Bacterial cells are about one-tenth the size of eukaryotic cells and are typically 0.5–5.0 micrometres in length.However, a few species are visible to the unaided eye—for example, Thiomargarita namibiensis is up to half a millimetre long Some bacteria, called vibrio, are shaped like slightly curved rods or comma-shaped; others can be spiral-shaped, called spirilla, or tightly coiled, called spirochaetes.Many bacterial species exist simply as single cells, others associate in characteristic patterns: Neisseria form diploids (pairs), Streptococcus form chains, and Staphylococcus group together in "bunch of grapes" clusters.Bacteria can also group to form larger multicellular structures, such as the elongated filaments of Actinobacteria, the aggregates of Myxobacteria, and the complex hyphae of Streptomyces.The ancestors of modern bacteria were unicellular microorganisms that were the first forms of life to appear on Earth, about 4 billion years ago.

For about 3 billion years, most organisms were microscopic, and bacteria and archaea were the dominant forms of life.Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats.Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep portions of Earth's crust.The study of bacteria is known as bacteriology, a branch of microbiology.There are typically 40 million bacterial cells in a gram of soil and a million bacterial cells in a millilitre of fresh water.In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy.

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