One of the easiest ways to tell if a website is secure is by looking for a Trust Seal.
“Typically, these seals are associated with secure sockets layer, or SSL for short,” states John Rampton, a Forbes contributor. “This simply means that your site has been verified and that there is a secure transmission for customers to safely enter their credit card information.”
When you are shopping online, you may have run into one of the seals and not even realized it. If you searched for a store through Google, for example, you probably have seen the small logo with a checkmark that states “Google Trusted Stores,” which is the search engine's own Trust Seal. There are also several other companies that examine stores and give out trust seals.