What is the best way to fill the gap between a tile and tub for a seamless and waterproof finish?

One effective method to fill the gap between a tile and tub for a seamless and waterproof finish is to use a silicone caulk specifically designed for bathrooms. Apply the caulk along the joint where the tile meets the tub, ensuring a tight seal. Smooth out the caulk with a caulk tool or your finger for a clean and professional look. This will help prevent water from seeping in and causing damage.