According to definitions from oxford languages, (in psychology or linguistic analysis) group together (connected items or words) so that they can be stored or processed as single concepts.
Putting in the context of business management, chunk groups together each part of your business operations from sales processing (payments and book keeping), managing inventory and customers to getting real time update about business performance all in one place.
In a short form, Chunk is a simple book keeping solution that helps to receive payment, manage sales records, inventory, customer and get a 360 view of your business performance.