In Italian, consonants can be divided into pure and impure sounds (or simple and complex sounds). While both types can occur anywhere in a word, they only really matter, grammatically speaking, at the beginning of masculine nouns.
The Italian definite article (il, lo, la, i, gli, le) indicates either a particular noun or, contrarily, the general sense of a noun.
The aptly named indefinite article (un, uno, una, dei, degli, delle) indicates an unspecific or unidentified noun.
The partitive article (del, dello, della, dei, degli, delle) refers to an unspecified quantity of food, liquid, or some other uncountable noun. English has no equivalent article – the partitive is usually translated by the adjectives “some” or “any,” or may be left out entirely.