The process of giving an answer to a question or a statement.

जवाब देना

English Usage: He is replying to the comments on his blog.

Hindi Usage: वह अपने ब्लॉग पर टिप्पणियों का जवाब दे रहा है।

The act of responding to something, often a message or inquiry.

उत्तर देना

English Usage: Her replying to the email was prompt.

Hindi Usage: उसके ईमेल का उत्तर देना त्वरित था।