  The origin of the large scale structure in the universe - galaxies, quasars,
clusters, voids, sheets - is one of the most important questions in cosmology.
One can show that some non-thermal energy density fluctuations must have been
present in the early universe. These fluctuations grew by gravitational
instability to form the observed structures. There are at present two families
of models to explain the origin of these initial fluctuations: inflationary
models and topological defect scenarios. Current observational developments
provide a link with theoretical predictions, allowing us to test our
theoretical models. In this contribution, I present a sketch of the current
status of the origin of cosmological structure formation.
