Lounges are used to give space away from busy teriminals, reduce stress, and provide a comfortable area to relax before a flight. Most airport lounges give out free snakcs and drinks, as well as provide free wifi and comfortable seating. A lot of them now have charging stations and it's own seperate wifi from the main airport wifi. Usually people who use these lounges are first or business class members. Frequent flyers and credit card holders also have access to these lounges.
Hotel Lounges are a large common space that has dining, small business ceneters, a few Tv's a computer and printer, seatings like chairs and couches. Some have bars with a bartender They provide free meals and snacks. People use it as a retreat from their rooms, a place to meet new people, or a place to work. You can get access to these lounges if you book a room at a "club/concierge" level
House lounges are a common area in a house that is used for relaxing, socializing and entertaining guests. Usually people will use this space to unwind, watch TV, read. Usually you interact with family members or friends in this space. Another word to define a space like this is called a "living room". This room can also be called a front room. When it is near the main entrance at the front of the house. These type of lounges became common and popular in the mid 19th century. It replaced the term parler and drawing room. With the rise of suburbs, increased free time, and the invention of the television, the living room became a main hangout spot for families.