Hello @Robson Soares ,
Welcome to the Microsoft Q&A platform.
Libraries provide reusable code that you may want to include in your programs or projects. To make third party or locally-built code available to your applications, you can install a library onto one of your Spark Pools (preview). Once a library is installed for a Spark pool, it is available for all sessions using the same pool.
This article provides different ways to manage libraries for Apache Spark in Azure Synapse Analytics.
Hope this helps. Do let us know if you any further queries.
----------------------------------------------------------------------------------------
Do click on "Accept Answer" and Upvote on the post that helps you, this can be beneficial to other community members.