What is the difference between a “booster” dose and a third dose?

Third doses in a series of either Pfizer or Moderna have been recommended for people with severe to immune compromising conditions because of the possibility their first two doses might not be enough to fully protect them. These doses are given at least 28 days past their second dose and should be the same vaccine they already received. (There is no additional dose for J&J vaccine at the moment.)  

Booster doses of Pfizer vaccine are another dose given 6 months past the second dose of Pfizer for  anyone who fits the booster criteria. (see next question)

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1. Are second boosters available?
2. Are boosters available for children ages 12-15?
3. Where can I get a COVID vaccine?
4. What is the difference between a “booster” dose and a third dose?
5. Who is eligible for a “booster” shot?
6. Is the Health Department offering “booster” doses?
7. What does “moderate to severe immunocompromise'' mean?
8. I have a moderate or severe immunocompromise, how do I find a third dose of vaccine?
9. Does the Health Department have Pfizer, Moderna and J&J Vaccine?
10. I lost my vaccine card or need vaccine record information.