A customer portal is a private, authenticated area of a business’s website or web application where customers log in to interact with the business on their own terms. Unlike a public website (which anyone can browse) or internal software (which only employees use), a customer portal gives each customer controlled access to their data: invoices, documents, orders, projects, support history, and account settings.
Common customer portal features include billing and payment, document sharing, secure messaging, ticket submission, knowledge base access, and self-service account management. Modern portals increasingly include AI chatbots with access to authenticated customer context.
For the full overview, see What Is a Customer Portal?. For industry-specific patterns, see our industry directory.