Homologation is a process by which the Spanish Ministry of Education recognises that your secondary school studies give you access to a Spanish University, on the same terms as if you had studied in Spain.
An essential step to be able to start the registration procedures for universities in Spain, and must be done by every student who studied outside the European Union. The procedures and required papers vary according to the required academic stage, but there are common matters that must always be taken into account:
1- All papers must be certified by the Ministry of Education, then the Ministry of Foreign Affairs, then the Spanish Embassy.
2- All papers must be translated by a certified sworn translator in Spain (or in your country, but you need to go through the certification procedures again)