Google Trends does filter out certain types of searches, such as:
Searches by very few people: Trends only shows data for popular terms, so terms with low search volume will show "0"
Repeated searches: Trends eliminate repeated searches by the same person over a short period of time.
Special Characters: Trends filters out queries with apostrophes and other special characters.
Google Trends is not a scientific poll and should not be cayman islands mobile database confused with poll data. It simply reflects search interest in a particular topic. A spike in a particular topic does not reflect that a topic is "popular" or "winning" in some way, just that for some unspecified reason, a lot of users seem to be performing searches about a topic. Google Trends data should always be viewed as one data point before drawing conclusions.
How to better use and interpret Google Trends data?
This post from Google News Lab explains in detail how Google Trends works and how people can appropriately utilize the data.