Mail Merge
It is a feature in word processing software, such as Microsoft Word or Google Docs.
It allows one to create personalized documents, such as letters, emails, envelopes, or labels, for multiple recipients.
It automates the process of merging a template document with a data source, such as a spreadsheet or a database.
It to generate individualized documents for each entry in the data source.
One can create bulk communications while still customizing certain elements, like names or addresses, for each recipient.
LibreOffice Writer Mail Merge feature can be proved to be a very useful tool in such a situation.