Cyber security is important to protect against increasing cyber crimes and attacks. There are various types of cyber crimes like hacking, theft and cyber stalking. Hackers are individuals who use technical skills to overcome problems but sometimes commit crimes by illegally accessing systems. Common cyber attacks include fraud, spying, stalking and warfare. It is important for social media users to take safety measures like using strong unique passwords, customizing privacy settings, and being cautious of what they share online to help prevent attacks and unauthorized access. Cryptography provides confidentiality and security by encrypting messages using techniques like symmetric key algorithms that use a shared key, and asymmetric key algorithms that use public and private keys.