It's more specifically an infinitive phrase. This means it consists of the infinitive form of the verb "to be" (which is "to be") and can function as a noun, adjective, or adverb in a sentence.
Here are some examples:
* Noun: "To be happy is the goal." (The phrase "to be happy" is the subject of the sentence)
* Adjective: "I have a desire to be successful." (The phrase "to be successful" modifies the noun "desire")
* Adverb: "She's too young to be driving." (The phrase "to be driving" modifies the adjective "young")
Let me know if you'd like more examples or have any other questions!