When you complete a program from a vocational school you can either earn a Certificate or a Diploma.
Vocational Schools are also know as 'Trade Schools' or 'Technical Schools' depending on the country.
These mostly secondary or post-secondary schools designed to provide students with trade skills in order to help them become more employable or even start your own business.
A vocational schools usually partners with some business or professional organization to ensure their teaching standards are adequate for industry and that the certification or diploma they provide will be valid nationally or sometimes, even internationally.