The lego app fetches data from the Rebrickable API (https://rebrickable.com/api/). It serves Lego sets based on themes, such as Movies, City, Space, Pirates, knights, Creator and Sports. This Lego app is built with Angular, Angular Material and Tailwind on the Front-end, and Express and TypeScript on the Back-end. P5.JS is used to add keyboard interactions on the home page.