The e-filing portal is a website that allows taxpayers to file their income tax returns online and access various tax-related services. The e-filing portal is maintained by the Income Tax Department of the Government of India. You can use this portal to file your income tax return, link your Aadhaar with PAN, verify your return, check your refund status, pay your tax, and more. You can also download various forms and utilities from the portal. You need to register on the portal with your PAN and create a password to access the services. You can also use the e-filing mobile app to file your return and access other features.