Big data is mainly a marketing term to me. I've been involved in a Big Data project that wasn't because someone wanted to massage their CV with fancy tech. With

Big data is mainly a marketing term to me. I've been involved in a Big Data project that wasn't because someone wanted to massage their CV with fancy tech. With current multicore machines and SSDs or cheap spinny disks you can hold and process incredible amounts of data. So, serious question, how do you define big data? By some size threshold, or "it can't possibly be done on a single box", or something else? And If I may, what is the BD work that you do (feel free to decline that one). TIA