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Bacteria are typically unicellular but often form specialized surface-attached communities called biofilms in nature.As cells multiply, they form microcolonies and communicate through quorum sensing, where chemical signals trigger behavioral changes once a population threshold is reached.Biofilm formation begins when environmental signals induce genetic changes in planktonic cells, prompting them to attach to surfaces using appendages like flagella and pili.

Bacteria are typically unicellular but often form specialized surface-attached communities called biofilms in nature.
Biofilms play critical roles in microbial pathogenesis, environmental quality, and incur significant economic costs due to equipment damage, product contamination, and medical infections.
While most biofilms consist of multiple species, single-species biofilms can also form, such as Pseudomonas aeruginosa in the lungs of cystic fibrosis patients.
Biofilm formation begins when environmental signals induce genetic changes in planktonic cells, prompting them to attach to surfaces using appendages like flagella and pili. These cells produce an organic monolayer that facilitates further attachment. As cells multiply, they form microcolonies and communicate through quorum sensing, where chemical signals trigger behavioral changes once a population threshold is reached. This process enhances biofilm resilience and the production of a protective extracellular matrix.