I am successful in a selection procedure and I have been included in a reserve list, what does it mean?

Interview/written test

It means that within the next 2 years, you are eligible to receive a job offer from Europol for the post you applied for or for a similar position, should the business opportunity arise. It is not an obligation for Europol to employ you and also you are not obliged to accept if you are unhappy with the terms and conditions of a similar vacancy.