special journals
In a busy shop the same kinds of transactions repeat hundreds of times: cash comes in, cash goes out, goods are sold on credit, goods are bought on credit. Writing each one as a full general-journal entry, line by line, is slow and error-prone. Special journals are extra journals, each dedicated to one common type of transaction, so the routine work flows faster.
The four classic special journals are the sales journal (credit sales), the purchases journal (credit purchases), the cash receipts journal (all money coming in), and the cash payments journal (all money going out). Because every line in, say, the sales journal does the same thing (debit Accounts Receivable, credit Sales), you can record just the variable details and then post the column totals in one move at period-end, instead of posting each transaction separately. Anything that does not fit a special journal still goes in the general journal.
Special journals matter as a manual-era efficiency device: they cut repetitive posting and let several clerks each keep one journal at once. In computerized systems they have largely disappeared from view — entering a sales invoice in the software does the same sorting automatically. So treat them as the logic behind today's software modules rather than books you will physically keep.
A store makes 80 credit sales in a month, each recorded as one quick line in the sales journal. At month-end the single column total — say $40,000 — is posted once as a debit to Accounts Receivable and a credit to Sales, instead of 80 separate postings.
One column total posted once, replacing many separate postings.
Special journals are largely a manual-bookkeeping efficiency tool; modern accounting software performs the same sorting automatically, so you rarely keep them as physical books today.