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The immune system is a very complex and effective mechanism that helps keep us healthy by destroying dangerous bacteria, viruses, and
parasites.    One part of the immune system is made up of proteins called immunoglobulins.  There are 5 different types of
immunoglobulins in the immune system:

Immunoglobulin A
Immunoglobulin G
Immunoglobulin M
Immunoglobulin E   
Immunoglobulin D

Immunoglobulins make antibodies.  The function of antibodies is to recognize and neutralize foreign particles that might enter the body.    
Each specific type of immunoglobulin makes a certain type of antibody:   

Immunoglobulin A makes IgA antibodies
Immunoglobulin G makes IgG antibodies
Immunoglobulin M makes IgM antibodies
Immunoglobulin E makes IgE antibodies

Each type of antibodies has a different purpose.    The main function of IgE antibodies is to fight parasites.    Unfortunately, IgE antibodies
also are the cause of allergic reactions.     In allergies, the body makes IgE antibodies to proteins that may not normally be harmful.    For
example, the body might suddently make IgE antibodies to peanut proteins.    The result is that when a peanut is eaten, the IgE antibody to
peanut will be activated, and an allergic reaction will develop.    
IgE Antibody