Immunodeficiency disorders are conditions that weaken the body's immune system, making it less effective at fighting infections. These disorders can be either primary, caused by genetic factors, or secondary, resulting from external factors like infections or medications. People with immunodeficiency disorders are more susceptible to frequent and severe infections. Common examples of immunodeficiency disorders include HIV/AIDS, which attacks the immune system directly, and X-Linked Agammaglobulinemia, a genetic condition that affects antibody production. Diagnosis often involves blood tests to assess immune function, and treatment may include medications, immunoglobulin therapy, or lifestyle changes to reduce infection risk.