Using a spreadsheet or word processor template that can be downloaded or made from scratch is "manual invoicing." The person issuing the invoice must fill up the fields in this template before sending it to the customer as an attachment to an email.
Creating invoices for goods sold or services performed, reminding customers to make payments, collecting payments, and keeping track of your sales and receivables via reports are all tasks handled in-depth by invoicing software. Software for creating bills has premade templates that you can use; OnlineCheckWriter.com is one such platform you can go for!