## TL;DR
Chemical bonding — the forces holding atoms together in molecules — determines all material properties. From ionic bonds in salt to covalent bonds in DNA, understanding bonding is foundational to chemistry.

## Core Explanation
Ionic bonds: electron transfer creates oppositely charged ions held by electrostatic attraction (NaCl). Covalent bonds: electron sharing (single, double, triple). Metallic bonds: delocalized electron sea. VSEPR theory predicts molecular geometry from electron pair repulsion. Hybridization (sp/sp²/sp³) explains bonding in organic molecules.

## Detailed Analysis
Electronegativity difference determines bond type: <0.5 = nonpolar covalent, 0.5-1.7 = polar covalent, >1.7 = ionic. Molecular orbital theory explains bonding in molecules where Lewis structures are inadequate. Spectroscopy (IR, NMR, UV-Vis) probes molecular structure.

## Further Reading
- OpenStax Chemistry 2e (free)
- Royal Society of Chemistry
- Khan Academy: Chemistry