The accounting cycle involves analyzing transactions, journalizing entries, and posting to accounts to track a company's financial activities over a period. At the end of the period, adjusting entries are made for deferred and accrued revenues and expenses to update account balances according to accrual accounting. This ensures revenues and expenses are recorded in the proper period before financial statements are prepared. Adjusting entries may defer existing balances, accrue new balances, or allocate asset costs like depreciation over multiple periods using methods such as straight-line depreciation. T-accounts are used to track debits and credits to accounts during this process.