This chapter is an introduction to the whole book. It explains why people should care about attention and attention models both in terms of science as it is a first step to our own consciousness but also in terms of technology as artificial intelligence might benefit a lot from the understanding of human or animal attention. Afterwards, the chapters deal with the public of the book which is quite large from students to researchers from different domain like cognitive psychology, engineering, computer science and neuroscience and define the book overview.