Pets are often like extension of the person or the family. It's not just an animal, it's part of the lives of the people. When we say pets people often think of dogs and cats. It can be fishes, birds etc. People love pets but the problem for some starts after they actually bring home the pets and start looking after them.
If one cannot be responsible enough to take care of the daily needs of the pets, they should not venture into it. Pets are a very good companion to help us out of stress, loneliness and boredom.
Based on personal experience, having an aquarium of colorful lives fishes (need not be the expensive ones) is very good. We just have to switch off the other lights and just look at them swimming around. time spent to care of them, feeding them is time well spent away from the stress of daily live and profession.
Dogs and parrots are good friends for humans who need a lively being around them, they make people happy, laugh and interact like a good friend.