How to copy data from AWS Redshift table to S3 bucket?

Here is the steps to copy data from AWS Redshift table to S3 bucket

pre-request:
1)we  need user created with privilege to access AWS redshift +S3 bucket
2)we need access_key_ID & secret_access_key for the user

we have utility called UNLOAD used to  extract  data from redshift tables to S3 bucket