what is jsonb in postgres code example

Example 1: json with postgresql

SELECT info ->> 'customer' AS customer,
	info -> 'items' ->> 'product' AS product
FROM orders
WHERE CAST ( info -> 'items' ->> 'qty' AS INTEGER) = 2

Example 2: postgres json

UPDATE users SET data = jsonb_set(data, '{name}', '"John"');

Example 3: postgres json

UPDATE users SET tags = tags || array['admin'];