Why inputStreamReader and OutputStreamWriter classes hasbeen designed in java?

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i studied inputStreamReader used to convert bytes to Character and OutputStreamWriter for Charcter to Byte. But what does it actually mean here by this i.e Charcter to Byte conversion and byte to charcter conversion. What actually happens internally .Everything is stored as bytes in our system . can't we use simply byte stream classes for reading and writing data of any type. Please help me to make this concept clear.

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