According to Google, the world's online population will double to five billion by 2020
• Google provides tech startups with low cost or free-of-charge spaces to meet and work at the campuses
• It also gives these startups business mentoring.
"The connected population is going to double in five years. Five billion online. Everyone with the entire internet in their pockets," Google Europe president Matt Brittin said in Warsaw as he opened his company's fifth "campus" for IT startups.
"That's a huge opportunity," he said, adding that "this is a transformational period."
"Five years where we'll go from a minority to a majority of the people on the planet being connected. That's why the moment is now for startups to look up and out and think about that market of five billion people that you can connect with in the next five years."
Google chose a renovated vodka distillery in a poorer area of the Polish capital for its first "campus" for IT business startups in eastern Europe.
The facility is one of five tech hubs the global IT giant has created worldwide, with a sixth planned to open in Sao Paulo, Brazil, in the first half of 2016.
Google, which got its start in a garage, provides tech startups with low cost or free-of-charge spaces to meet and work at the campuses, along with business mentoring.
Brittin said that although Google is a search engine, it has also become "a growth engine for entrepreneurs and for the economy."