A laissez-passer (from the French let pass) is a travel document issued by a national government or certain international organizations, such as the United Nations, and European Union. A laissez-passer is often for one-way travel to the issuing country for humanitarian reasons only. Some national governments issue laissez-passers to their own nationals as emergency passports. Others issue them to people who are stateless, or who are unable to obtain a passport from their own government, or whose government is not recognized by the issuing country.
Israel has visa exemption agreements with many countries - for visits of up to 90 days. This exemption applies only to visas for visits for passports, and not for laissez-passer holders.
People with no nationality must hold a valid laissez-passer, as well as a visa back to the country that issued it.
On the application, check "Passport" if you are an ordinary passport holder.