A covalent bond involves the sharing of electron pairs between atoms. This type of bond occurs when two non-metal atoms combine, allowing them to attain a more stable electronic configuration. The strength of covalent bonds varies, affecting the properties of the resulting compound. Covalent compounds can be found in many biological molecules, such as proteins and DNA. Understanding covalent bonding is fundamental in chemistry, especially in explaining molecular structures and reactions that are essential for life processes.