Many countries within the EU and Schengen have previously removed the requirement for vaccine passports, covid certificates or other certificates. This is because the pandemic has weakened and now Spain's health care authority has also decided to follow suit.
Travelers coming from other countries will still be checked upon entry and the health declaration and fever check will be required.
The decision has its background in the fact that vaccination coverage in Spain is high and is above the average within the EU and, of course, a reduction in covid patients.