Bacteriophage T7 is a type of virus that specifically infects bacteria, particularly Escherichia coli (E. coli). It belongs to the family of T7-like phages and is known for its simple structure, consisting of a protein coat that encases its genetic material, which is made of DNA. T7 is widely studied in molecular biology due to its ability to replicate quickly and efficiently within bacterial cells. This bacteriophage has been instrumental in genetic research and biotechnology. Scientists utilize T7's unique properties to develop tools for gene expression and protein production. Its well-characterized life cycle and ease of manipulation make it a valuable resource for understanding viral behavior and developing phage therapy as an alternative to antibiotics.