Bootstrap is a free and open-source front-end framework for designing websites and web applications. It contains HTML and CSS-based design templates for typography, forms, buttons, navigation and other interface components, as well as optional JavaScript extensions.
Tripadvisor is an online travel agency that assists customers in gathering travel information with user-generated content like posting reviews, opinions of travel-related content and engaging in interactive travel forums. It also offers online hotel reservations and bookings for transportation, lodging, travel experiences, and restaurants