"Without big data analytics, companies are blind and deaf, wandering out onto the web like deer on a freeway."
– Geoffrey Moore
Hadoop is an open source software developed by Apache for distributed computing, allowing analysis of big datasets in a secure way. It departs from the principle that every kind of machine has faults that happen often so they need to be cured by the software. Spark is a similar tool, being another kind of big data structure developed by Apache. But while the focus of Hadoop is secure data storage, the focus of Spark is data processing. They are different entities, but they mess things up, mainly because Spark is often used to process data held in Hadoop's filesystem.
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