A 250g butterscotch sauce is a sweet, rich, golden-brown condiment made from butter, brown sugar (with molasses for depth), and cream, often with vanilla, used as a topping or filling for desserts like ice cream, cakes, and brownies, sold in a 250-gram (or ~250ml) quantity for home use. Its flavor comes from caramelized brown sugar, offering toffee-like notes with creamy butteriness, and it’s enjoyed warm or cold, as seen in various retail listings. 
Key Characteristics:
Ingredients: Primarily butter, brown sugar (rich in molasses), and cream.
Flavor: Deeply sweet, buttery, with caramel/toffee undertones.
Texture: Smooth and flowing when warm, thickens as it cools.
Usage: Versatile topping for desserts, fillings for baked goods, or drizzled over pancakes/waffles. 
What the “250 g” Means:
It indicates the net weight of the product, common for sauces and syrups, making it a standard serving size for home bakers and dessert lovers.