What is an antibody?

Once administered, vaccines don’t harm your body. Instead, they trigger the production of a vital protein known as an antibody. Antibodies allow the body to quickly identify a foreign invader and then help the immune system shield itself from that threat. The body creates antibodies after recognizing a virus – either through a vaccine or everyday exposure. The difference is that, with a vaccine, your body will have practiced its response to mitigate or prevent unwanted health consequences before you are exposed to the actual virus.

In other words, antibodies are the soldiers guarding your body, protecting it from possible threats.

Related Questions
How do vaccines help?
By readying the immune system for future health battles, vaccines protect individuals around the world from dangerous diseases. 
What is an antibody?
Once administered, vaccines don’t harm your body. Instead, they trigger the production of a vital protein known as an antibody.
How will we know a Covid-19 vaccine is safe and effective?
With vaccine development moving so quickly, it’s easy to understand why some people are asking whether a vaccine for Covid-19 will be safe and effective. But it is important to remember the very strict scientific and regulatory process vaccine developers must follow to bring a new product to patients, even during the current pandemic.