Particles, Superstrings, and D-Branes.- Solitons and Particle Physics.- Dimensions of Solitons, Dimensions of Superstring Theory.- D-Branes.- Dynamics of D-Branes.- Braneworld (Application 1).- Inflationary Cosmology in Higher Dimensions (Application 2).- Entropy of Blackholes (Application 3).- Holgraphy and QCD (Application 4).- Toward Description of Ultimate Theory.