What type of expression is referred to as a 'paean'?

A 'paean' is a term that specifically denotes a formal expression of praise or tribute. This type of expression is often used in literature, music, and other art forms to celebrate and honor someone's achievements or virtues. The word originates from the Greek 'paian,' which referred to a song of thanksgiving or an ode to a god. In various contexts, a paean can convey deep admiration and can elevate the subject being praised, often highlighting their positive attributes or significant contributions.

Understanding that 'paean' is closely tied with celebratory or laudatory themes helps clarify why it aligns with the notion of a formal expression of praise. The other options, while related to forms of communication, do not capture the essence of what a paean represents. Informal jokes or remarks, critical reviews, and brief summaries do not embody the celebratory and formal qualities that define a paean, highlighting the uniqueness of the correct answer in the context of the given question.