A free card that gives you access to medically necessary, state-provided healthcare during a temporary stay in any of the 27 EU countries, Iceland, Liechtenstein, Norway and Switzerland under the same conditions and at the same cost (free in some countries) as people insured in that country. The benefits covered include, for example, benefits provided in conjunction with chronic or existing illnesses as well as in conjunction with pregnancy and childbirth.
when you move your habitual residence to another country, you should register with the S1 form instead of using the EHIC to receive medical care in your new country of habitual residence.