CrowdFlower is a company that helps businesses to get work done more quickly and accurately by getting people like you to do small tasks that a computer cannot yet do. It's like if you were asked by your teacher to reorganize the classroom bookshelves. You would grab the books, put them in the right order and the right spots on the shelves, and you would feel like a superhero because you helped the teacher save time and make the classroom better, right?
With CrowdFlower, different businesses or companies have a lot of small jobs that they want to do faster, but they need many people to help. For example, a big company might want to know what products are available in a store by looking at pictures, but it would take too long to do for one person, so they might ask you to just look at a few pictures and tell them which products are in the picture. The company would then pay you a small amount of money for your effort, which is like saying thank you for helping us out.
All you need is an internet connection and a few minutes of free time to complete a task. This means you can help businesses and learn new things while playing a small part in the bigger picture.