A study by Incapsula claims a whopping 61.5 percent of all website traffic is now generated by bots, a significant increase versus last year's figure of 51 percent. Some of these bots steal data or post spam, but the biggest growth in traffic was for "good" bots, which includes search engine spiders.
From the article: 'Some of these automated software tools are malicious - stealing data or posting ads for scams in comment sections. But the firm said the biggest growth in traffic was for 'good' bots. These are tools used by search engines to crawl websites in order to index their content, by analytics companies to provide feedback about how a site is performing, and by others to carry out other specific tasks - such as helping the Internet Archive preserve content before it is deleted.'"