A soliloquy is a dramatic technique in which a character speaks their thoughts, feelings, or inner conflicts aloud, usually while alone on stage. It allows the audience to understand the character’s private emotions, intentions, and motivations. Unlike a dialogue, which involves two or more characters exchanging words, a soliloquy typically presents one character’s extended speech without expecting a response from another character. It is an important feature of Elizabethan and Shakespearean drama. For example, in William Shakespeare’s Hamlet, the famous “To be, or not to be” speech is a soliloquy in which Hamlet reflects on life, death, and suffering. A soliloquy differs from an aside, which is a brief remark intended for the audience or another specific listener that other characters on stage are conventionally understood not to hear. Therefore, “An act of speaking one's thought aloud” is the best answer because it describes the central purpose of a soliloquy in drama.