you know in Landon they call Cookie jar as  biscuit jars
In London? That's interesting what else do they say differently ?
it the jar made of tinplate they used to called as biscuit tins
But are biscuits the same as the cookies we eat here in America ?
cookies look small sweet and flat
oooo so not the same, what do they do differently than us ?
Cookie
A cookie is a baked or cooked food that is typically small, flat and sweet. It usually contains flour, sugar and some type of oil or fat. It may include other ingredients such as raisins, oats, chocolate chips, nuts, etc.
In most English-speaking countries except for the United States and Canada, crisp cookies are called biscuits. Chewier biscuits are sometimes called "cookies" even in the United Kingdom. Some cookies may also be named by their shape, such as date squares
Cookie jar
Cookie jars are utilitarian or decorative ceramic or glass jars often found in American and Canadian kitchens. In the United Kingdom, they are known as biscuit barrels or biscuit jars. If they are cans made out of tinplate, they are called biscuit tins. While used to store actual cookies or biscuits, they are sometimes employed to store other edible items like candy or dog treats, or non-edible items like currency (in the manner of a piggy bank).
Origin and history.
Cookie jars