The Pug is part of the Toy group. Breeds in this group have traditionally been bred primarily for companionship, so they thrive on affection and human contact.
Pugs have been around for hundreds of years, and were brought from China to Europe in the 16th century. They appear in many portraits from the 18th and 19th centuries, albeit with longer legs and noses than the pugs seen today. They flourished in 19th century England under the reign of Queen Victoria who kept and bred many of them.
Today they are the 4th most popular pedigree breed registered with the Kennel Club, with over 10,000 puppies registered annually. They are often described by the latin phrase "multum in parvo" which means "a lot of dog in a small space".
It is worth noting that due to their flat, wide heads, flattened faces and short muzzles, they are categorised as brachycephalic. This means they may be at higher risk of certain health conditions including breathing difficulties, skin problems, dental problems, and eye conditions.
Not all pugs will have these health conditions but it is important to be aware of them, and please do research as much as you can. The breed club is a good place to start, and make sure you feel comfortable that the breeder is a responsible breeder that has checked the health of both parents.