The Budapest Declaration on Machine Readable Travel Documents is an agreement among countries to make passports, visas and other travel documents easier to read by computers. The agreement states that all passports, visas and other travel documents will have a machine-readable zone, which is a special area of the document that contains all the personal information printed on it. This means that computers will be able to quickly scan the documents and read all the personal information, making it easier for immigration officers and airlines to process the documents accurately and quickly.