Handheld clickers became a staple of positive reinforcement dog training in the 1990s, when trainers used the sharp click to mark the exact moment of good behaviour before giving a reward. The same short snap later moved online into pet videos, training tutorials and meme edits, where the sound alone signals success without explanation. Creators reuse it for animals, gaming clips and everyday wins because audiences already associate the click with praise, treats and correct answers, keeping the tiny effect useful long after its training origins.