One valuable normal for Multibit is that it doesn’t have to download the whole piece chain to get to, send and get reserves. Likewise, with most programming wallets, Multibit scrambles your private keys locally or on a USB stick.
Multibit is a lightweight programming wallet. Here is a list of wallets for secure Bitcoin storage. Which wallet you choose depends on whether utmost security or increased convenience is more important, and it’s recommended that you don’t stick to one particular type of wallet.
As you might imagine, the security of your private key is essential, lest someone gains access to your wallet and spend all the Bitcoins you’ve mined or traded for.