Can DataNode and NameNode be commodity hardware

Question

I have a bit confused about this, can I get the clarification?

Answer 1

DataNodes are the commodity hardware only as it can store data like laptops and personal computers, these are required in large numbers. Instead, NameNode is the master node; it stores metadata about all the blocks stored in HDFS. It needs high memory space, thus works as a high-end machine with great memory space.