The difference between driver.findElement() and driver.findElements() commands is-
findElement() returns a single WebElement (found first) based on the locator passed as parameter. Whereas findElements() returns a list of WebElements, all satisfying the locator value passed.
Syntax of findElement()-
WebElement textbox = driver.findElement(By.id(“textBoxLocator”));
Syntax of findElements()-
List <WebElement> elements = element.findElements(By.id(“value”));
Another difference between the two is- if no element is found then findElement() throws NoSuchElementException whereas findElements() returns a list of 0 elements.