The String Landscape, the Swampland, and the Observed Universe

<!--HTML--><div> <p><span><span><span style="color:#000000"><span><span><span><span><span><span><span><span><span><span><span><span><span style="color:#222222">I review ideas related to the landscape of string vacua and restrictions it suggests on the existence of consistent quantum gravitational theories known as swampland conditions.&nbsp; Some implications for particle physics and cosmology are discussed.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p> </div>