For setup of oracle RAC infrastructure, we need to install Oracle Grid infrastructure and Oracle RAC licensed oracle products.
Oracle RAC coordinates and synchronizes multiple database instances to access the same set of database files and process transactions on the same database. And it runs above the Oracle Grid infrastructure on each RAC nodes.
And configuration of multiple node RAC database needs proper installation and configuration of Oracle Grid infrastructure and Oracle RAC products.
Amen Edited answer 13/07/2022