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What are antigens and antibodies?

antibodies
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In Immunology, an antigen is a molecule or molecular structure that can bind to a specific antibody or T-cell receptor OR it is a complex molecule normally protein or a polysaccharide that stimulate the production of a particular antibody. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.

Antibodies

An antibody, also called immunoglobulin, are protective protein produced by the immune system in response to the presence of a foreign substance.

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