Tongue twisters are passages that are difficult to pronounce quickly and accurately due to alliteration or consonance. They can help improve pronunciation, fluency, and accents. This document provides 50 common English tongue twisters ranging from well-known ones like "Peter Piper picked a peck of pickled peppers" to more complex ones involving similar sounding words like "Which wristwatches are Swiss wristwatches?". Mastering tongue twisters can help improve confidence as a speaker.