Can Apple Watch be connected to Samsung galaxy’s s8

Apple watches require a compatible iPhone - not an Android phone or an iPad.

From here: Apple Watch Series 3 - Technical Specifications

"Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or later with iOS 11 or later. Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later. Apple Watch Series 1 requires an iPhone 5s or later with iOS 11 or later."

~Lyssa

Hi

No, it cannot.

Apple Watch cannot be used at all (even for telling the time) without being paired to a compatible model of iPhone.

This is required in order to set up and use all models of Apple Watch, including for managing and syncing with the Apple Watch over time:

• Apple Watch Series 3 (GPS + Cellular) requires an iPhone 6 or newer model of iPhone running the latest version of iOS 11.x.
• Apple Watch Series 3 (GPS) and all other Apple Watch models requires an iPhone 5s or newer model of iPhone running the latest version of iOS 11.x.

Apple Watch cannot be set up and used on a standalone basis or synced with a Samsung phone or with any other device from Apple or any other manufacturer.

More information:

Set up your Apple Watch - Apple Support

Update the iOS on your iPhone, iPad, or iPod touch - Apple Support