مركز VPAT

A VPAT (Voluntary Product Accessibility Template) is the blank standardised template published by ITI. An ACR (Accessibility Conformance Report) is what you get once a vendor fills that template in for a specific product: the completed, customer-facing document. In short: VPAT is the template, ACR is the completed report. The two terms are often used interchangeably in practice, but technically a company writes an ACR using the VPAT template.

Not universally, but it's required in specific contexts: US federal agencies must consider Section 508 when buying ICT, so they routinely ask vendors for an ACR (usually built on the VPAT) in RFPs. EU public buyers commonly ask for EN 301 549 conformance information. Outside government procurement, VPATs aren't legally mandated, but Fortune 500 and other large enterprise buyers commonly require a current one before signing a contract. Whether or not it's legally required in your case, a VPAT is a legal declaration once written. Intentionally false conformance claims can violate the False Claims Act (for US federal contractors) or equivalent procurement laws elsewhere.