solet' presume have movie pairokaymaybe star wars and the empire strikes back find list of everyone who watched both of those moviesthen compare their ratings to each otherand if they're similar then can say these two movies are similarbecause they were rated similarly by people who watched both of them that' the general idea here that' one way to do itthere' more than one way to do itand then can just sort everything by the movieand then by the similarity strength of all the similar movies to itand there' my results for people who liked also likedor people who rated this highly also rated this highly and so on and so forth and like saidthat' just one way of doing it that' step one of item-based collaborative filtering-first find relationships between movies based on the relationships of the people who watched every given pair of movies it'll make more sense when we go through the following example