How are viruses different from bacteria

Viruses need a host cell to reproduce

Antibiotics can kill bacteria but not viruses.

Bacteria are intercellular organisms (i. e. they live in-between cells); whereas viruses are intracellular organisms (they infiltrate the host cell and live inside the cell). They change the host cell's genetic material from its normal function to producing the virus itself.

The biggest difference between viruses and bacteria is that viruses must have a living host - like a plant or animal - to multiply, while most bacteria can grow on non-living surfaces.

Viruses are the smallest and simplest life form known. They are 10 to 100 times smaller than bacteria.

There are some useful bacteria but all viruses are harmful.