The Ethereum keystore file is usually located in the user’s home directory. On Windows, it is located in the C:\Users\\AppData\Roaming\Ethereum folder. On Mac, it is located in the ~/Library/Ethereum folder.
On Linux, it is located in the ~/.ethereum folder.
The keystore file contains the private keys for your Ethereum account. It is encrypted with a password that you choose.
NOTE: WARNING: The Ethereum Keystore File is a sensitive file that stores private keys and passwords. It is important to keep your Ethereum Keystore File in a secure location. Do not share the exact location or file on any public networks, forums, or websites. If your Ethereum Keystore File is compromised, it can put you at risk of losing funds associated with the wallet address associated with the file.
If you lose your keystore file, you will lose access to your account and any ether that is in it.
Be sure to back up your keystore file in a safe place!.