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The study of the internal structure of star clusters provides important cluesconcerning their formation mechanism and dynamical evolution. There are bothobservational and numerical evidences indicating that open clusters evolve froman initial clumpy structure, presumably a direct consequence of the formationin a fractal medium, toward a centrally condensed state. This simple picturehas, however, several drawbacks. There can be very young clusters exhibitingradial patterns maybe reflecting the early effect of gravity on primordial gas.There can be also very evolved cluster showing fractal patterns that eitherhave survived through time or have been generated subsequently by some(unknown) mechanism. Additionally, the fractal structure of some open clustersis much clumpier than the average structure of the interstellar medium in theMilky Way, although in principle a very similar structure should be expected.Here we summarize and discuss observational and numerical results concerningthis subject.

Internal Structure of Stellar Clusters: Geometry of Star Formation