Final answer:
The Writable interface is used to write data to a file in a customized format, while the WritableComparable interface is used to compare two writable objects. These interfaces are important in Hadoop.
Step-by-step explanation:
The Writable interface is a part of the Apache Hadoop framework and is used to write data to a file in a customized format. It provides methods for serializing and deserializing objects.
The WritableComparable interface is also a part of the Apache Hadoop framework and is used to compare two writable objects. It extends the Writable interface and adds a method for comparing two objects.
These interfaces are important in Hadoop because they define the behavior of the key and value objects that are used in MapReduce jobs