The Script component hosts a .NET script and enables the SSIS package to include and run custom script code. The Script component provides an easy and quick way to include custom functions in a data flow.
Do not use this tag for the SSIS Script task, instead use script-task.
Check the following article for more information: SSIS Script task vs. Script Component
General Information
SSIS Script component is a prominent strength of SQL Server Integration Services since it allows developers to implement any complex logic and utilize libraries from the powerful .NET framework or third-parties.