[jll29]

TFIDF (Spärck Jones (1972) Journal of Documentation) is a weighting scheme for word frequencies in the vector space model of information retrieval.

In constrast, MAP and NDCG (and others, like Precision, Recall, F1-score, MRR) are _evaluation_ metrics.

So the former are part of systems, the latter are part of measuring the quality of systems.