setTimeout and setInterval are both JavaScript functions used for executing code at specified times, but they have distinct purposes and behaviors. Here's a breakdown of the differences: 1. setTimeout Purpose: Executes a function once after a specified delay. Syntax: javascript কোড কপি করুন setTimeout(function, delay, param1, param2, ...); function: The function to execute. delay: Delay in milliseconds (1 second = 1000 milliseconds). param1, param2, ...: Optional parameters passed to the function. Example: javascript কোড কপি করুন setTimeout(() => { console.log("This message appears after 3 seconds."); }, 3000); Behavior: Runs the callback function once after the delay. 2. setInterval Purpose: Executes a function repeatedly at specified intervals. Syntax: javascript কোড কপি করুন setInterval(function, interval, param1, param2, ...); function: The function to execute. interval: Time in milliseconds between each execution. param1, param2, ...: Optional parameters passed to the function. Example: javascript কোড কপি করুন setInterval(() => { console.log("This message appears every 2 seconds."); }, 2000); Behavior: Runs the callback function repeatedly at every interval until canceled. Key Differences Feature setTimeout setInterval Execution Executes a function once. Executes a function repeatedly. Delay Delay is a one-time wait. Delay is the interval between repeats. Stopping Not needed as it runs only once. Use clearInterval to stop execution. Use Case Delayed single action. Repeated periodic tasks. Stopping Execution setTimeout: No stopping required as it runs once. setInterval: Use clearInterval() to stop. javascript কোড কপি করুন const intervalId = setInterval(() => { console.log("Repeating message"); }, 1000); // Stop after 5 seconds setTimeout(() => { clearInterval(intervalId); console.log("Interval stopped."); }, 5000); Which One to Use? Use setTimeout when you need to delay an action. Use setInterval when you need repeated actions at regular intervals.