Ionic compounds are interesting materials that we come across every day. They are important for many things we do. Let's take a look at some common examples and how they are used:

1. Sodium Chloride (NaCl): We usually call this table salt. It's really important for making food taste better and for keeping it from going bad. In chemistry, it shows how sodium ions ($\text{Na}^+$) and chloride ions ($\text{Cl}^-$) bond together.

2. Calcium Carbonate (CaCO₃): You can find this in things like chalk, limestone, and marble. It's often used in construction and is also a supplement for calcium, which our bodies need. In this compound, calcium ions ($\text{Ca}^{2+}$) connect with carbonate ions ($\text{CO}_3^{2-}$).

3. Magnesium Sulfate (MgSO₄): This is better known as Epsom salt. People use it in relaxing baths and sometimes as a laxative to help with digestion. Here, magnesium ions ($\text{Mg}^{2+}$) bond with sulfate ions ($\text{SO}_4^{2-}$).

4. Potassium Nitrate (KNO₃): This compound is used in fertilizers and for keeping food fresh. It connects potassium ions ($\text{K}^+$) with nitrate ions ($\text{NO}_3^-$).

These examples show us that ionic compounds are not just things you see in a chemistry lab; they also have a big impact on our everyday lives!