One characteristic of the immune response is specificity. This means that immunity is directed against a particular pathogen
Explanation:
The ability of the body to protect itself from the attack of pathogen or antigen and maintain this state of  protection is called immunity.
Immunity has been broadly classified as -Innate immunity and adaptive immunity.
Innate immunity is present since birth and is not antigen specific.
Adaptive immunity is developed during the life time and it is highly antigen specific.
