  An overview of pulsating variable stars across the observational
Hertzprung-Russel (HR) diagram is presented, together with a summary of their
global properties. The HR diagram is presented with a third colour-coded
dimension, visualizing the fraction of variable, the amplitude of variability
or the period of variability. The distribution of variable stars in the other
observational diagrams, such as the Period-Amplitude diagram, is also
presented. Some of the progresses performed in the field of variable stars
during the last decade are briefly summarized, and future projects that will
improve our knowledge of variable stars are mentioned.
