Do we actually know something about hunger in the world?

The thing is we don't know where does hunger live. 'In Africa' you'd hear if you ask the question to the first persons you see around you.
We don't know either how many people are suffering from hunger. 'Millions... because they are millions in these third-world countries'...
And finally we have no clue at all what is hunger. 'When it's already 3pm and you haven't eaten yet'. Thanks.

'Pulizer Prize' winning photo taken by Kevin Carter in 1994 during the Sudan famine. 

What is hunger?
First of all, hunger is designated as the want or scarcity of food in a country, according to the Oxford English Dictionnary. We also talk about malnutrition as the technical term for hunger. That is to say a lack of some or all nutritional elements necessary for human health.
With these definitions we clearly see that hunger doesn't necessarily mean dying from it but also suffering months and years from not eating enough or good enough.

How many suffers from it in the world and where do they live? 

As the graphic shows 925 million of people suffer from hunger worldwide and most of them live in Asia and the Pacific (578 million). This is the most recent estimate released in October 2010.

Out of 7 billion human being of eart, this 1 in 7 people that are hungry in the world. And the amount is not going down.