What is a hackerspace?

A YMCA for geeks and artists – Eric Michaud, of Pumping Station: One

From wikipedia:

A hackerspace or hackspace (also referred to as a hacklab, makerspace or creative space) is a location where people with common interests, usually in computers, technology, or digital or electronic art can meet, socialise and collaborate. A hackerspace can be viewed as an open community labs incorporating elements of machine shops, workshops and/or studios where hackers can come together to share resources and knowledge to build and make things.[1]

A list of all hackerspaces