What is the definition of Non-Specific & Specific Immunity?

Non-specific refers to "unlimited," while specific refers to "limited."

While non-specific immunity is effective against all pathogens, specific immunity is effective against a restricted set of pathogens.

Specific immunity, also called adaptive immunity, is the body's capacity to identify and mount a targeted response against particular pathogens or antigens through the action of specialized cells (T and B lymphocytes) and molecules (antibodies), which develop over time and provide long-lasting immunity. Non-specific immunity, also known as innate immunity, refers to the body's general defense mechanisms against pathogens, such as physical barriers (skin, mucous membranes), chemical barriers (acidic environments, enzymes), and cellular defenses (phagocytic cells, natural killer cells), which are present from birth and provide immediate protection.