这两天休息，在medium上看了不少的文章，主要是两方面，一方面就是专业相关的，比如data science，另一方面就是关于passive income。
其基本原理就是流量变现，其中流量这个词我可以确定是：traffic，因为绝大多数的文章都用的是traffic这个词。
这样的例子有很多，维基百科就有site traffic，网络流量这个词条。
基本上可以确认traffic就是流量，而stream这个词往往用在income 后面，比如income stream，现金流。
我猜测原因可能是traffic它是双向的，访客和网络都可以互相access对方，也就是维基百科的第一句话。
Web traffic is the data sent and received by visitors to a website。
而stream更偏向于是单向的。
除此之外，还学了几个不同的traffic。
除了organic traffic的中文对应有点儿疑问之外，其他的意思都还挺直接的。
Direct Traffic
As we mentioned, direct traffic is categorized as traffic that does not come from a referring website. If traffic is coming from an unknown source, it will likely be categorized as direct traffic as well.
Organic Traffic Organic traffic is any traffic that comes to your site from a search engine, but that isn’t paid for. Any organic traffic is going to be a result of your inbound marketing and SEO efforts.
Paid Search Traffic Paid search traffic is any traffic that comes from a paid search campaign you've launched on a search engine like Google or Bing.
Social Traffic Any traffic that comes from a social media website, like LinkedIn, Twitter, Facebook, or Instagram.
Email Traffic If you are properly tagging your email campaigns with email parameters, any traffic that arrives to your site from an email will show up as email traffic.
Referral Traffic Traffic that comes to your website from any other website that is not a social media platform or a search engine. Someone clicking over to your website from a hyperlink on another blog would be considered referral traffic.
Other If you have any traffic that doesn't fit into the above categories, or has been specifically tagged as "other", it will fall into this traffic category.