Vinay, a Data Engineer at GlobalMart, faced a "Table does not exist" error while querying data in Snowflake. Seeking help from Rahul, the Senior Architect, he learned about Access Control, including RBAC, DAC, object hierarchy, roles, and privileges. Rahul explained system-defined and custom roles, GRANT/REVOKE commands, and the importance of role ownership. By the end, Vinay understood how to check role assignments and request access efficiently.