Status and perspectives in the study of CMB.

In this contribution, I will present the current status of the measurements and analysis of the Cosmic Microwave Background (CMB), and I will concentrate on the problem of determining the nature of inflation. I will discuss what we know so far, and what we still need to understand, providing an overview of the experimental feats we need to address to achieve data of better quality to constrain inflationary models. I will also present an overview of astrophysical discoveries about our Galaxy and extragalactic objects obtained with CMB data.