What is a simple sentence for welcoming?

What's a concise yet welcoming sentence that could be used in a variety of settings to make people feel at ease and comfortable? I'm looking for something that's easy to remember and conveys a sense of warmth and hospitality, ideally in a way that's both professional and approachable. Could you provide an example of such a sentence, and perhaps offer a few variations or tips on how to tailor it to different contexts?