FIFA
In total, FIFA recognises 211 national associations and their associated men's national teams as well as 129 women's national teams; see the list of national football teams and their respective country codes. FIFA has more member states than the UN as FIFA recognises 23 non-sovereign entities as distinct nations, such as the four Home Nations within the United Kingdom and politically disputed territories such as Palestine.
FIFA World Cup
Since the second World Cup in 1934, qualifying tournaments have been held to thin the field for the final tournament. They are held within the six FIFA continental zones (Africa, Asia, North and Central America and Caribbean, South America, Oceania, and Europe), overseen by their respective confederations. For each tournament, FIFA decides the number of places awarded to each of the continental zones beforehand, generally based on the relative strength of the confederations' teams.