what is a acrostic poem

An acrostic poem is a poem in which the first letter of each line spells out a word, message, or the alphabet. It can be used as a mnemonic device to aid memory retrieval and is common in medieval literature. There are different types of acrostic poems, including those where the first, last, or other letters in a line spell out a particular word or phrase. It is a form of constrained writing and can be found among the works of ancient Greek and Latin writers, medieval monks, and Renaissance poets