Unsupervised Learning Algorithms

Well,…Unsupervised learning in itself says not supervised learning. Intuitively speaking,most of human and animal learning is unsupervised learning. We are not given right answer every where. We just make decision we find to be right and try to do less mistakes next time. Just like above, unsupervised learning is the process of learning by machines without having labels (right answer) and making less errors next time(clustering does it by placing data in nearest clusters).