What is a candlestick in a crypto chart?

Can you explain to me, in simple terms, what exactly is a candlestick in a cryptocurrency chart? I've heard the term being used frequently in discussions about market trends and analysis, but I'm not quite sure how it relates to the overall price movements and trading decisions. How does a candlestick represent information about the cryptocurrency's trading activity, and what are the key elements that make up a candlestick chart? I'd appreciate your insights on this topic.