La is the definite article for feminine nouns. Ex: La Fruta: The Fruit (Note: la and fruta both end in "a". That's how you know it's a feminine noun.)
For El it is the definite article for masculine nouns. Ex: El Libro: The Book (Note: for el, nouns end in "o")
Mis padres se van a la india este verano
Water molecules are electrically attracted to each other resulting to the water properties of cohesion, high specific heat, and high heat of vaporization.
The mother of my mother, my aunt, my grandmother, my sister-in-law, my sister's husband, my cousin, my brother-in-law, my grandson, the wife of my son, my mother, my daughter-in-law, my stepdaughter, the husband of my father's sister, my uncle, my cousin, my twin. the son of my son my uncle my nephew my grandson