  This thesis is devoted to the study of a class of constructions based on
Superstring Theory, baptized in the literature as Intersecting Brane Worlds. In
particular we explore several issues regarding the proposal of Intersecting
Brane Worlds as string-based models yielding semi-realistic low-energy physics.
We find that they provide an interesting framework where, for instance, just
the Standard Model chiral content and gauge group can be obtained.
  Although many of the results presented in this work are valid for more
general constructions, we center on configurations of D-branes intersecting at
angles. We construct several classes of such compactifications which may yield
realistic D=4 physics. We build several explicit examples giving the Standard
Model chiral spectrum, and then proceed to analyze some of the related
phenomenology. We pay special attention to features such as the structure of
U(1) global symmetries, the absence of open-string tachyons, the appearance of
light extra matter and the possibility of lowering the string scale in such
scenarios. Finally, we investigate the relationship between low-energy field
theory quantities, such as FI-parameters and Yukawa couplings, with the
geometrical objects underlying the string construction. We find that their
description is closely related to calibration theory and to the construction of
Fukaya's category.
