This image shows the horizon line. To the left is the Ascendant, and to the right is the Descendant. The Ascendant is the degree of the sign rising on the Eastern horizon when you were born. Another name for the Ascendant, shown on charts as ASC, is Rising sign.
The Rising sign is your outer personality cloak. But it's also the conduit through which you engage with the world. It determines things like your appearance, quirks, style, temperament, self-image, childhood experiences and so on. The Rising sign for this chart is Leo.