What does LTSC stand for?

Long-Term Servicing Channel. It receives monthly quality updates but no feature updates between releases, with support for up to 10 years.

Is LTSC better than regular Windows?

For specialized devices that need stability, yes. For general-purpose PCs, regular Windows with feature updates is the recommended choice.

LTSC for specialized devices ships through Windows IoT Enterprise per-device OEM licensing or volume licensing, not as a consumer retail key.

LTSC releases are supported for up to 10 years. Check the release documentation for the exact lifecycle dates.