簡言之，“https//” 的 s 就是 secure code 的意思，這樣開頭的網頁，才可以輸入你的個人資料如信用卡號等，千萬不要在 “http//” 開頭的網頁進行網上交易。詳細解釋請見以下轉寄的郵件：

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主旨： FW: 重要文件： "http" 跟 "https"有何不同?
The difference between http:// and https://
你知道"http" 跟 "https"有何不同嗎?
Once in a while， there is something that comes down the pike that is of real importance.有時這之間的差 異是很重要的
What is the difference between http and https ?
Don't know how many of you are aware of this difference， but it is worth sending to any that do not.....
http和https之間的差異，不 知你們有多少人注意到了，但還 是值得將此訊息傳送給還不知道 的人
**The main difference between http:// and https://is it's all about keeping you secure** HTTP stands for Hyper Text Transfer Protocol
http://跟https://之 間的差異在於網路文字傳送協定 標準不同。
The S (big surprise) stands for "Secure".. If you visit a website or web page， and look at the address in the web browser， it will likely begin with the following: http://.This means that the website is talking to your browser using the regular 'unsecured language. In other words， it is possible for someone to "eavesdrop" on your computer's conversation with the website. If you fill out a form on the website， someone might see the information you send to that site.
這僅一個字母S的差別代表"安全(secure)"，所以http://是 該網頁與你的電腦瀏覽器，以一 般(非 安全)模式在進行互動 交談，所以內容有可能遭攔截竊 聽；換句話說，你在此類網頁上 填寫傳送的資料有可能被有心人 士看到。
This is why you never ever enter your credit card number in an http website! But if the web address begins with https://， that basically means your computer is talking to the website in a secure code that no one can eavesdrop on.
這就是為什麼你從不會在http網頁輸入你的信 用卡資料! 但如果網址開頭 是https://， 基本上意謂著，你的電腦是以無 人能盜取得安全碼，與該網頁進 行互動交談。 You understand why this is so important， right? 你瞭解為什麼這 是如此重要了，對吧?
If a website ever asks you to enter your credit card
information， you should automatically look to see if the web address begins with https://.
請在輸入機密資 料時確認該網頁開頭是不是https:// 。
If it doesn't， You should NEVER enter sensitive information....such as a credit card number， SS # etc .
如果不是，請勿 輸入敏感資料....諸如信用卡號 碼，SS # 等等。