Databricks Runtime 7.3 LTS (Long Term Support) was a significant release for the Databricks platform. It was built on Apache Spark 3.x and included many enhancements for Delta Lake and the overall Databricks platform.

Key features and benefits of Databricks Runtime 7.3 LTS included:

• Easier development and running of Spark applications: Thanks to Apache Spark 3.0 improvements, including Project Zen, which aimed to align PySpark closer to Python principles and conventions.
• Improved Pandas UDFs: Leveraging Python type hints for a better developer experience.
• Enhanced Delta Lake capabilities: If you were not yet using Delta Lake, this release highlighted its numerous advantages over traditional data lakes, such as improved reliability, performance, and ACID transactions.