its an Ivy - Hedera helix (although one would need to look at its microscopic details to tell whether its an Irish Ivy (H. hibernica) or just the Common Ivy. Ivy can be misleading as it produces juvenile leaves which are a different shape to those on the more adult parts of the plant.
In case you're a tad confused, ivy leaves are sometimes discussed in terms of 'juvenile' and 'adult', as used by Fred here, and as used by many others. But it may be preferable to describe the two foliar habits as 'trailing' and 'arborescent'.
Ivies change their foliar habit depending on the amount of shade. In shady conditions, ivy will wander along the ground or up and over obstacles. When it finds good light, for instance at the top of a dead tree or the top of a wall, it changes to grow more upright and woody stems (arborescent), and changes the shape of its leaves as it makes this transformation. If conditions becomes shady again, the foliar habit on subsequent growth may revent to trailing.
Yours has arborescent leaves; the plant as a whole is not really juvenile in the 'pre-adult' sense of the word.