what kind of passport is the travel document
The most common travel document is a passport, which usually gives the bearer more privileges like visa-free access to certain countries.However, the term is sometimes used only for those documents which do not bear proof of nationality, such as a refugee travel document. Refugee travel document (formally: 1951 Convention travel document) are passport-like booklets issued by national governments to refugees under the 1951 Convention Relating to the Status of Refugees.