Is it true that sizes of some countries are shown smaller on Maps than they actually are? [closed]

I recently read somewhere that there are some countries in the world are actually larger than they are shown on the world map. For eg. Somalia is significantly larger than it is shown on the map and Congo is almost as the same size as India. Is this true ? Are they just shown smaller due to some calculations related to projections or are they actually larger in size and there is some geopolitics behind it ?