What is a Ransom Ware?

Recently, a ransom ware problem is becoming fierce increasingly. One cannot approach the computer system suddenly, or cannot open the stored photos, document files, and so on. It has started to become known in earnest since 2005, and is growing rapidly worldwide in 2013. So, what is this ransom ware?   Ransom ware is a compound word of 'ransom' and 'ware,' which requests money to computer users by taking the documents. In other words, it is a malicious program that requires users to send money