These are chemical agents that are used to treat bacterial infections and diseases.
Antibiotics are usually produced by microorganisms that are usually harmful to other microbes of different types.
Penicillin was the first discovered antibiotic.
Virus
Viruses are microscopic infectious entities that multiply and grow only inside the host's body using the host mechanisms.
They may have a single-stranded or double-stranded DNA or RNA as its genetic material surrounded by a protein coating or envelope.
Tobacco mosaic virus, rhino-virus, retro-virus, and the most infamous Covid-19 virus are some examples.
Viruses cannot be killed or harmed by antibiotics.
Antibiotics are administered only against bacterial pathogens and are ineffective against viral pathogens.
Viruses have a completely different structure and mechanism of infection, while antibiotics target certain structures or mechanisms in the bacterial pathogen.