How to click on Button in Selenium Webdriver

 The click() method is used to simulate the clicking of any element.              

In Selenium we have click () method of Webdriver Interface for clicking on Signup/Login/Sumit Button/Radio Button/Checkboxes

It does not take any parameter/argument.

//Here is the code
package test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class FacebookLogin {
public static void main(String[] args) {
WebDriver driver = new FirefoxDriver();
driver.get("http://facebook.com");
//Enter the text into emailaddress
driver.findElement(By.xpath("//*[@id='Email']")).sendKeys("ritu7180@gmail.com");
//Enter the text into password Filled
driver.findElement(By.xpath("//*[@id='Passwd']")).sendKeys("password");
//Clicking on signInButton
driver.findElement(By.xpath("//*[@id='signIn']")).click();
}
}