Many artist create hundreds of totally random works of art but others choose to create a series of work.
(Definition) Series: a number of usually similar things done, produced etc one after another.
For example an artist might create a series of Dogs, instead of dogs, cats, and elephants. That way the work can be specific and more in depth, the series can get even more focused to a specific breed of dog and dog color. This helps artists to explore different ideas on one topic, and relate to their audience. An audience is more likely to follow you if they can understand where your art is coming from, instead of just a pile of work that is all over the place.