A skeptic is a person who likes to ask questions when someone makes a claim.
Pretend one of your friends tells you that they can jump over a 100 meter building. Would you believe them?
A skeptic would ask if their friend if they have evidence to back up their claim. Evidence is information that might give us a good reason to accept what someone has said, is true – but we have to carefully examine the information to make sure it is reliable.
If your friend can’t provide evidence, then there might not be a good reason to think your friend’s claim is true! This doesn’t mean your friend is lying, it just means you haven’t been given a good reason to believe them!
A skeptic must always be open-minded. This means if evidence is given to them later on, they must be willing to think about it – and, if the evidence is good, change their mind.