Although the term "right side" might be a very common term in different professions and might mean different things, the only profession that uses this term the most is in any business-related discipline. The term right side is known as a credit in financial accounting.
During business transactions, the terms which are used to determine whether accounts are increasing or decreasing are credit and debit. So, while debit usually represents the left side, the right side is the credit. The general rule in the accounting equation is that it must in balance always i.e., the total amount of credits must equal to that of debits.
On the balance sheet, we have the liabilities and equity at the right side or credit side, while assets are on the left side or debit side. On the left side, the debt will continue to increase and the credit will be decreasing. In contrast, Credit will be increasing at the right side, while Debit will be decreasing.