The conjectural theory of mixed motives would be a universal cohomology
theory in arithmetic algebraic geometry. The monograph describes the
approach to motives via their well-defined realizations. This includes a
review of several known cohomology theories. A new absolute cohomology
is introduced and studied.
The book assumes knowledge of the standard cohomological techniques in
algebraic geometry as well as K-theory. So the monograph is primarily
intended for researchers. Advanced graduate students can use it as a
guide to the literature.