Immunological memory is probably the most important feature of immunity as it allows us to better respond when the threat (infectious agent) is encountered a second time.

Why is memory of the immune system important?

The reason is that immunological memory confers a tremendous survival advantage, as it confers the ability to respond more rapidly and more effectively to a second and subsequent challenge by the same pathogen.

What is the function of immunological memory?

Immunological memory is the ability of the immune system to respond more rapidly and effectively to pathogens that have been encountered previously, and reflects the preexistence of a clonally expanded population of antigen-specific lymphocytes.