HTTP is the protocol used to send data over the net. HTTPS is the secure version, hence the S for secure. Look at the address bar above, it has the 'https' instead of just 'http'.
HTTPS encrypts data to make it impossible for hackers to see your data. Don't enter credit card or personal information like social security numbers on websites that don't use HTTPS. HTTPS is being adopted more and more, it is quickly becoming the standard .