It's a term of endearment that can be used in various contexts:
* Romantic: It can be used to express love and affection for a romantic partner.
* Familial: It can be used to address family members, like a parent, child, or sibling.
* Friendly: It can be used to express affection towards close friends.
* Formal: It can be used in a formal context, like a letter, to address someone politely.
Here are some examples:
* Querido Juan: Dear John (a friend or loved one)
* Mi querida madre: My beloved mother
* Queridos lectores: Dear readers (in a formal context)
The specific meaning of "querido" will depend on the context in which it is used.