# Catalogues & categories ### What are catalogues Catalogues are root elements in category structures used for organizing products logically in categories. ### What are categories Categories are used to create hierarchical structures within a catalogue. Categories serves as a means for structuring products in meaningful classifications. Categories can be organized in a nested structure to form the desired hierarchical structure. There are no limitations to the number of categories and depth of category structure in the system. ### Standard category Standard categories allows classifying products and variant groups manually. ### Dynamic category Dynamic categories allows you to automatically classify products and variant groups, which meet certain criteria.