Let's try to clear this up with an easy explanation and experiment. Then we have to deal with the compounds. Finally there are the mixtures. These are combinations of compounds and account for most of what you encounter during the day. Take salt water, for example.
White sugar is a pure compound called sucrose.
Try to find some more examples of mixtures and compounds during a regular day. Chemistry in a Teabag Kids, there are all kinds of interesting things to think about when someone dips a teabag into a cup of hot water to make their hot tea. Inside a teabag are the crushed up dried leaves of the tea plant. Most of a tea leaf is cellulose, which is the major structural material of all plants. The tea molecules that will dissolve in water include tannins, flavonoids, and caffeine.