Database primary key fields have two varieties: numeric (int / longint) or Unique Identifier (UUID). Each type has specific advantages. Numeric keys are better for performance- size and speed. UUID keys are better for use in distributed systems, and are guaranteed(*) to be unique. Database designers tend to settle on one type in their system, and use it across all tables.
Like most database-ish people, I’ve worked with both types of key in different systems. Since my current job involves extreme levels of data traceability, I like the way UUIDs assure me that when I look up a product_id value, anything that is not a product_id is inherently excluded. In a system with numeric keys, the numeric value can represent key values of any table in the database.
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(*) UUIDs have a practically non-existent chance for duplication.