The core purpose of a digital catalog is to let buyers find answers themselves, rather than sending inquiries every time. PDF catalogs allow searching only by product name; even after finding a product, buyers still need to email for confirmation, limiting efficiency. A truly effective digital catalog requires two capabilities: First, a tagging system that lets buyers filter across multiple dimensions—such as material, specification, and application scenario—so there are multiple paths to find the same product. Second, complete SKU display; for example, one model with variations in outer diameter, inner diameter, and color might generate 60+ SKUs. When all are listed and support comparison, buyers can make decisions immediately without follow-up inquiries. With no physical constraints and constant updating capability, the catalog stays current at all times.