What you meant Retained Earnings? When the Entries are created and what is the entry?

It refers to the earnings or loss that the company retains at the end of the year/end of the period.
It is basically the portion of net income from end of the year which is retained by a corportation.
If the net income is positive then profits for that period are retained.
If the net income is negative then losses for that period are retained

The Retained Earnings is retained from business or the total profits generated in a financial year which is not distributed to shareholders..