What is Crypto Currency?
Crypto currencies are a by-product of blockchains. The purpose of blockchain extends far beyond Crypto currencies. Its merely a token used to remunerate the people who help to add new blocks.
The transparency in system is what attracts investors towards blockchain technology. Its not bitcoin or the unregulated market that prevails for Crypto currencies.
Analyzing the purpose of a blockchain will help you decide whether or not you want to invest in its Crypto currency. It is similar to how you do fundamental analysis of companies before investing in its stock in the share market.