Antibiotics are chemicals released by microorganisms to kill microbes outside their body. These days we generate large quantities of various antibiotics, in industries, and use them as medicines to fight microbial infections. Antibiotics can be broad ranged or very targeted. They can be antibacterial or antifungal, depending on the antibiotic in question. They can act by either killing the microbe or by slowing down (or inhibiting) its growth or spread. An example is penicillin.
An antibody, on the other, is a protein which is secreted by our body's immune system, in response to the presence of foreign particles in our system. An antibody is also known as an immunoglobulin. The antibody interacts with the foreign particle (also known as antigen) and either directly neutralizes it or tags it for action by our components of our immune system.
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