Accounting, at its heart, is a promise-keeping system. Every time money moves, two things happen at once: something you own changes, and something you owe or own outright changes to balance it. A shop sells goods for cash — the cash box grows, and the value of stock shrinks by the same amount. Write only one of those down and the books lie. Write both, and the books stay honest. That single idea, that every transaction has two equal and opposite sides, is double-entry accounting, and it is the foundation on which any serious accounting software is built.
GNUKhata is one such piece of software. It is a free and open-source accounting package that lets an organisation keep its books electronically instead of on paper or in a spreadsheet. You record transactions, and it maintains the ledgers, computes balances, and produces the standard financial reports — the trial balance, the profit and loss statement, the balance sheet — without you having to add up columns by hand.
The "free and open-source" part deserves a moment, because it is not just a price tag. Free means you can download, install, and use it without paying a licence fee, and you can inspect the source code, modify it, and redistribute it. For an organisation that is cost-sensitive — a small business, a co-operative, a school, an NGO — this matters: professional-grade bookkeeping without a recurring software bill. Open-source also means the accounting logic is transparent and auditable, which is a genuine virtue when the whole point of the software is to produce trustworthy numbers.
Now the precise picture. GNUKhata implements the double-entry system faithfully. You set up your organisation, define the accounts you need (cash, bank, sales, purchases, capital, and so on), and then enter transactions. Each entry touches at least two accounts, with total debits equal to total credits — the software enforces this, so an unbalanced entry simply cannot be saved. From these entries it derives the ledger of each account and rolls them up into the financial statements.
The defining rule of double-entry, which GNUKhata enforces on every entry, is that total debits must equal total credits. This is what keeps the accounting equation — Assets = Liabilities + Equity — intact after every transaction. …