Hadoop Ecosystem is neither a programming language nor a service, it is a platform or framework which solves big data problems. You can consider it as a suite which encompasses a number of services (ingesting, storing, analyzing and maintaining) inside it. This ecosystem comprises of multiple components such as:
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HDFS
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MapReduce
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Hive
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Spark
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HBase
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YARN etc.
Each of these components have their own use cases. As a whole, it can be used with big data.