Yes, Bitcoin can be stolen through various means such as hacking, phishing, malware attacks, or physical theft of devices where Bitcoin is stored. It's important to take necessary security measures to protect your Bitcoin holdings, such as using secure wallets, enabling two-factor authentication, and keeping your private keys safe.
Hacking is one of the biggest reasons why Bitcoins can be stolen in different ways. Bitcoins can certainly be stolen if a wallet is hacked. Or if the device in which Bitcoin is stored (laptop, tablet, mobile phone) is stolen, then Bitcoin can be stolen. Many times different investors hold Bitcoin holdings in exchange wallets for some reason if that central exchange is hacked then there is a possibility that the Bitcoins will be stolen.