Hummingbird is basically a change in how Google interprets the intent of a user’s query to ensure the returned results are appropriate.
For example, if I were to search for ‘’how do I install blue widgets in my house’’, Google would return a set of results that may be included the words ‘’install’’, ‘’blue widgets’’ & ‘’house’’. With Hummingbird, Google will be placing greater emphasis on the other words in the search query such as ‘’how do I’’ and ‘’my house’’.
More on it here:
http://econsultancy.com/hk/blog/6348...h-algorithm-th