String Theory originated as an attempt to describe strong interactions but evolved into a candidate "Theory of Everything," aiming to unify all fundamental forces, including gravity, with matter by positing that fundamental entities are vibrating 1D strings (and higher-dimensional branes). Its treatment of gravity is radically different from standard QFT approaches and GR itself, arising as an inevitable consequence of the theory's structure rather than being put in by hand. However, it faces significant conceptual and empirical challenges. Loop Quantum Gravity takes a different path from String Theory. Instead of unifying gravity with other forces by postulating new fundamental entities (strings), LQG attempts to apply quantum mechanics directly to the geometric degrees of freedom described by General Relativity itself, using techniques related to canonical quantization but reformulated in terms of new variables (connections and triads, related to gauge theory). Its central aim is a background-independent quantization of spacetime geometry.