"Ready Made" means the company is formed and put in list for purpose of selling.
There are already 2 shareholders each holding 1 share. Instead of forming a brand new tailor made company, we arrange to transfer the 2 shares to new shareholders.

The company can be used instantly and saves time of at least 7 days.
Other than saving time, sometimes you may need a company with incorporation date several months ago.
This helps for management to "ratify" (or "inject") certain business transaction into a company.