This is the 3482nd most frequent Swedish word.
choklad
Chocolate.
Here, 'choklad' is used as a noun referring to the general concept or type of food 'chocolate'.
Jag älskar choklad och äter det varje dag.
I love chocolate and eat it every day.
In this instance, 'choklad' specifies the type of chocolate being discussed, 'dark chocolate'.
De säljer mörk choklad i den här butiken.
They sell dark chocolate at this store.
Here, 'choklad' refers to a specific chocolate owned by someone and hence makes it concrete through possession.