A palindrome is a word, phrase, number, or sequence that reads the same backward as forward. Common examples include words like racecar and level, as well as phrases such as "A man, a plan, a canal, Panama!" Palindromes can also be found in numbers, like 121 or 12321. These linguistic curiosities are often used in puzzles and word games, showcasing the playful side of language. Palindromes can be simple or complex, and they appear in various languages. Their unique symmetry makes them a fascinating topic for both linguists and enthusiasts alike.