WhatsApp doesn't have a built-in feature to lock individual chats. However, you can use third-party apps designed to protect and hide chats on your device.

WhatsApp has end-to-end encryption, which means messages are protected during transmission and can only be read by the sender and recipient.

Yes, you can adjust your privacy settings on WhatsApp to decide who can see your profile picture. You can choose to allow everyone, only your contacts, or no one to see your profile picture.

Yes, WhatsApp offers biometric security features on some devices. You can enable the WhatsApp lock option using your fingerprint or facial recognition, depending on your device's capabilities.

WhatsApp doesn't have a native feature to hide specific messages from others within the app. However, you can archive conversations to keep them out of the main view and protect their content.

Yes, WhatsApp offers the option to enable two-step verification to add an extra layer of security to your account.

When sharing personal information on WhatsApp, it’s important to exercise caution. While WhatsApp uses end-to-end encryption to protect messages, it’s possible that personal information shared in chats could be accessed by unauthorized people if they have access to your device or if you’re interacting with someone with bad intentions.