What is the XT in AMD?

Could you please elaborate on the significance of the "XT" suffix in AMD's product lineup? I'm particularly interested in understanding how it differentiates from their non-XT offerings and what kind of performance improvements or unique features it might entail. Is it a simple branding strategy or does it indicate a tangible upgrade in terms of specifications and capabilities? I'm curious to know if there's a consistent trend in AMD's approach towards branding their XT series, and how consumers can benefit from choosing an XT variant over its standard counterpart.