There are 2 types of Bitcoin wallet that Cold wallet and Hot wallet.

Hot wallet is a wallet address where users can spend electronic money from any time and almost always have to stay connected to the Internet to be able to remain connected to the bitcoin network.

On the other hand, cold wallets are the opposite, when using a cold wallet you do not intend to use regular expenditures, but you can still get money from someone else at any time. Cold wallet will not connect to the Internet directly, as it is used to store bitcoin offline. Without a connection between the purse and the internet, hackers can not steal money from your wallet.

I know that Bitcoin is becoming popular and there are more and more people invest in it but which reason do you think that people invest in Bitcoin?

I think you shoud read some documents and articles about Bitcoin first to know well about it. Then you can start to watch video to get deeper to Bitcoin world, bros.