The blood group O positive(O+) specifies that the person can donate his/her blood to any other person of same or different blood group. But, O+ can accept blood only from a person having same blood group (i.e O+) and not from any other group.
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It means that there are no A or B molocules attached to each of your blood cells. It is not a big deal what blood type you have but it can effect what blood you can receive and who you can donate too.