No. 20: Amazon.com
Number of unique visitors: 163 million
Introduction: Amazon.com is the most important online shopping site, with everything from appliances, clothing, sporting goods and even food.
Growth: Amazon began by hiring a few employees to package and ship books. But it has since grown into an all-encompassing shopping site that sells everything from musical instruments to Kindle Fire tablets.
No. 19: Sina (Sina.com.cn)
Number of unique visitors: 169 million
Introduction: Sina.com is one of China's media and UGC mobile portals.
Growth: At the beginning of the 21st century, Sina was seen as "China's Yahoo", and Sina Weibo, which was launched in 2009, now has more than 400 million users.
No. 18: WordPress (Wordpress.com)
Number of unique visitors: 170.9 million
Introduction: Wordpress.com is a blogging platform.
Growth: WordPress is a very easy-to-use blogging and web publishing tool that has attracted a large number of users. Being an open source tool, WordPress does not require external licensing fees, which is one of its advantages over other similar sites. 2004, after Movable Type changed its licensing agreement, many people turned to the WordPress platform.
No. 17: Apple (Apple.com)
Number of unique visitors: 171.7 million
Profile: The official website of Apple Inc.
Growth: Apple's online store is housed on Apple.com, which also provides support for all Apple products. Apple.com is also the default home of the Safari browser, which comes pre-installed on countless Apple devices.
No. 16: Sohu (Sohu.com)
Number of unique visitors: 175.8 million
Profile: Chinese portal and search engine.
Growth: Founded in 1997, Sohu was China's first search engine company. Sohu then evolved into a large portal that also provides content such as game portals and real estate.
No. 15: Bing.com
Number of unique visitors: 184 million
Introduction: Microsoft's search engine site.
Growth: Microsoft has put out a huge advertising investment for Bing and has gone to great lengths to improve its ease of use by adding social sidebar features and improving its algorithms. Microsoft also pays a fee to sites that link to Bing.
No. 14: Twitter (Twitter.com)
Number of unique visitors: 189.8 million
Profile: A real-time communication platform
Growth: Launched in 2009, Twitter has become the go-to site for news from around the world. News organizations, politicians and experts from all walks of life have opened accounts on Twitter, making it a very important source of information.
No. 13: Taobao.com
Number of unique visitors: 207 million
Profile: China's e-commerce platform for merchants selling a wide range of goods, including clothing, jewelry, food, and electrical appliances.
Growth: Similar to eBay and Amazon, Taobao is one of the largest e-commerce platforms in the world. Taobao's parent company, Alibaba, announced in 2003 that you don't have to pay the site to open a store on Taobao, which has helped it become a large shopping and search platform.
No. 12: Ask (Ask.com)
Number of unique visitors: 218.4 million
Profile: Search engine.
Growth: Originally known as AskJeeves, Ask.com was founded in the late 1990s. After its parent company, IAC, was acquired by About.com, tons of new content was added to the site. The current Ask.com can essentially be seen as a post-labeled Google Search.
No. 11: Blogger (Blogger.com)
Number of unique visitors: 229.9 million
Profile: Blogging platform.
Growth: Blogger started out as a small company in San Francisco and was hit hard by the bursting of the Internet bubble. Google went out and bought Blogger in 2002.
No. 10: MSN (MSN.com)
Number of unique visitors: 254.1 million
Profile: Microsoft's portal.
Growth: MSN was first just an ISP, then a must-have site for people, Hotmail and MSN Messenger have portals on MSN. It is currently a portal.
No. 9: Baidu (Baidu.com)
Number of unique visitors: 268.7 million
Introduction: Chinese website, audio and image search engine.
Growth: Baidu is one of the most popular search engines in China. It employs thousands of top-notch engineers in China who continue to improve search quality and speed.
No. 8: Microsoft.com
Number of unique visitors: 271.7 million
Introduction: The official website of Microsoft Corporation, where users can purchase Microsoft hardware and software products and download software updates.
Growth: There are countless devices around the world that use Windows, and the bookmarks in the built-in browsers of these devices contain Microsoft's official website, where users can find customer support and other services.
No. 7: Tencent (QQ.com)
Number of unique visitors: 284.1 million
Profile: China's search engine and portal.
Growth: Tencent, the company behind QQ.com, owns China's most popular instant messenger. Tencent QQ has more than 700 million active users, which has fueled the growth of Tencent's Qzone and Tencent Weibo products, among others.
No. 6: Live Mail (Live.com)
Number of unique visitors: 389.5 million
Introduction: Microsoft's mail service.
Growth: Through Live.com, users can access Hotmail and Outlook, two e-mail services that were also launched by Microsoft. Currently, users visiting Hotmail.com and Outlook.com are redirected to Live.com.
No. 5: Wikipedia ( Wikipedia.com)
Number of unique visitors: 469.6 million
Synopsis: Free online encyclopedia.
Growth: Anyone can post and edit content on Wikipedia, making it an excellent platform for educational content. Like Answers.com, Wikipedia gets a lot of traffic from Google because it answers questions people ask on Google.
No. 4: Yahoo.com
Number of unique visitors: 469.9 million
Synopsis: A search engine that is also able to pour users down other Yahoo-owned services such as Yandex Mail and Flickr.
Growth: Yahoo is one of the oldest portals, and people enjoy visit Yahoo for news, sports, and financial information, and Yahoo Mail also has a lot of users.
No. 3: Youtube (Youtube.com)
Number of unique visitors: 721.9 million
Introduction: a platform for uploading, sharing and watching videos.
Growth: Google's acquisition of Youtube.com in 2006 made it even more well-known. Since then, people have been fascinated by all the interesting videos on Youtube, and have also used it to discover new stars like Justin Bieber.
No. 2: Google (Google.com)
Number of unique visitors: 782.8 million
Introduction: search engine.
Growth: Google began its foray into the hot search engine market in the late 1990s, eventually winning on the strength of its speed and design. Google now offers a variety of products such as Gmail, Google Maps, and Google+, and it is a way for people to explore the Internet.
No. 1: Facebook (Facebook.com)
Number of unique visitors: 836.7 million
Profile: Social networking site.
Growth: Facebook, a site founded by its CEO Mark Zuckerberg when he was a sophomore at Harvard, was initially developed only for Harvard students, then gradually expanded its user base to other universities, and eventually opened it up to all Internet users over the age of 13.