What is the difference between il and lo in Italian with an l not I as lard?

Il

* Il is a definite article (the) that is used with masculine singular nouns.

* Example: Il libro (the book)

* Il is also used as a personal pronoun (he) in the third person singular.

* Example: Il ragazzo (the boy)

* Il can also be used as a possessive pronoun (his) in the third person singular.

* Example: Il suo libro (his book)

Lo

* Lo is a definite article (the) that is used with masculine singular nouns that begin with a vowel sound.

* Example: Lo studente (the student)

* Lo is also used as a pronoun object (him, it) in the third person singular.

* Example: Lo vedo (I see him)

* Lo can also be used as a possessive pronoun (his, its) in the third person singular.

* Example: Lo zaino (his backpack)