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In chemistry, a double bond is a type of chemical bond where two electron pairs are shared between two atoms. Specifically, a carbon-carbon double bond involves two carbon atoms. In this bond, each carbon atom contributes two electrons, making a total of four electrons involved in the bonding process.
Double bonds are stronger and shorter than single bonds. They are represented by two horizontal lines between the two carbon atoms, like this: C=C.
Understanding the nature of double bonds is crucial as they affect the molecule's shape, stability, and reactivity. For example, molecules with double bonds tend to be less flexible because the double bonds restrict the rotation around the bond axis.

When we talk about shared electron pairs, we are referring to two electrons that are shared between atoms to keep them bonded together. In the case of a carbon-carbon double bond, there are two sets of these shared electron pairs.
To visualize this, imagine each pair of electrons like a bond-line drawn between two atoms. In a double bond, this means you have two parallel bond lines between the two carbon atoms: C=C. Each bond line signifies one pair of electrons.
The more electron pairs shared between atoms, the stronger the bond. Double bonds are typical in molecules with high stability and low reactivity due to the extra energy required to break them.

Chemical bonding is the process that holds atoms together in molecules and compounds. There are several types of chemical bonds, including ionic, covalent, and metallic bonds.
A carbon-carbon double bond is a type of covalent bond, where electrons are shared between two atoms. In this case, four electrons are shared between two carbon atoms.
Different bonds affect the properties of the molecules they form. Double bonds, for example, contribute to the rigidity and shape of the molecule. This concept helps us understand complex molecules' structure and behavior based on simpler principles.