Unlike English or French which have lots of contractions, in Spanish there are only two that are accepted as grammatically correct and both involve prepositions combining with el (the):

   del = de (from; of) + el
   Es la luz del mundo.
   He is the light of the world.

   al = a (to; at) + el
   Escucho al profesor.
   I listen to the professor.

It is important to note that these do not contract with él (he) or with if el is part of a name:

   Correct: ¿Lo diste a él?
   Incorrect: ¿Lo diste al?
   Did you give it to him?

   Correct: Es un producto de El Salvador.
   Incorrect: Es un producte del Salvador
   It is a product from El Salvador.