How does immune system remember a particular pathogen?

How does immune system remember a particular pathogen?
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For survival reasons or otherwise, the immune system would savea "file" of certain intruders and threats based on traits andcharacteristics. The protein, called Lck, is what "teaches" T-cells(white blood cells that attack viruses and other threats) toidentify the characteristics of pathogens, whether clearly orvaguely identified within the body. As a result, Lck helps preventthe body's immune system from being constantly weighed down by a"biological hard drive" remembering all cell and invaderstatuses.
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