Letter of Recommendation is a certificate that is your assessment by your superior, Professor/employers. This document testifies your professional skills as perceived. There is less consideration given in India to LORs (Letter of Recommendation) whereas in German universities they value them highly.
LORs are just like a SOP, which tells your story and it should be exclusive and unique.
In some German universities, you need to mention your recommender's email address in the application form. Soon your recommenders will receive an email which contains a form/link of few direct questions which need to be addressed by him/her.
In case, your recommenders are having a busy schedule or don't have time to write for you, then they will ask you to send draft a LOR so that they don't have to write a whole recommendation letter.