: Do we need vaccines for different things after our childhood? Recently, as the news about COVID vaccine is everywhere, I'm seeing some similar stuff on many sites like "we will need yearly vaccine like other vaccines",

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To get this out of the way: I'm not a doctor nor do I play one - please take everything with a grain of salt.
You are most likely not vaccinated against everything as a kid (why should you - for example against tropical diseases) however when you visit certain coutries as an adult (or kid) you should or need in certain cases get vaccinated before you enter.
There are certain vaccines that "expire" once you have them in your body.
Expire is probably the wrong choice of word, however if you get something like the "flu shot" you would need to renew it yearly because the flu mutates and evolves and might be a new virus when it comes around next time.
Also read up on how vaccines work, that will answer a lot of questions as well.
Basically and to oversimplify a vaccine infects you with a cripplet version of the virus, so that your body can produce antibodys agaist it (as if you were infected and cured with the disease) but you usually don't get sick, because your immune system is strong enough to deal with the less lethal virus with few or no symthoms and still produce the antibodies requiref to become immune.