If you're conducting business online, including banking or shopping online with your credit card, you expect your information will be securely transmitted. We don't even need to get into finances, though, because you also expect something as simple as the password to your inbox to be sent securely when you log in. How can you know? There are two easy ways to tell if the Web page you're on is a secure page.
First, look at the URL in the address bar in your browser. URLs that begin with https are secure; pages beginning with http are not. Second, depending on which browser you use, you can look for the lock. It differs from browser to browser but a lock icon will appear in either in the address bar (before the https) or in one of the lower corners of the browser window. Click on the lock and you'll learn all the security details about that Web page.