Hertzsprung - Russell Diagram is the software implementation of H-R [Hertzsprung-Russell] diagram in stellar astronomy. This software is to make the H-R diagram a little bit more handy to the astronomers adding some extra features inspite of just getting Temperature(K) and Absolute magnitude of a star. It serves the data about the Luminosity and Radius of a star, for a Sun-like star it gives the data about Mass, Life-Expectancy when you click on the diagram in the software. This software contains a stellar Banque de données of about 450 stars with data-update facility. You can plot the star on the diagram directly from the Banque de données. You can comparethe relative Taille of the stars with respect to the Sun along with the expected colour of the star. You can print the data of a specific star in a text file in your HDD. The software is designed for those astronomers/astrophysicist who are seeking for the data about the various features of the stars in the universe.The software is suitable for the begginers also, it contains a short introduction about the Hertzsprung - Russell diagram. The Hertzsprung - Russell Diagram is a shareware. After 7 days from installation some functionality (e.g. Banque de données access) would be disabled. You have to register for full use of the software afterwards.