The map below shows the % threshold in elections: a party is allowed to have representatives in the parliament if their votes meet the minimum % of total votes cast in an election.
0% means that a party can have even a single MP.
10%, which is the threshold in Turkey, means that votes cast for many parties are simply lost. So when AKP says they have 50% of the votes, this refers only to 50% of the ‘valid’ votes excluding those cast for parties that did not pass the threshold.
In countries with many parties, thresholds are put on to ensure that elections don’t end up in coalition governments, but in, what is seen as more stable, single party governments. However, at 10% it gives too much power to a single party.
For Turkish and more statistics which can be read through numbers and colour-coding without having to know Turkish: http://cloudpage.co/baraj