1. A larger molecule: This is formed by the joining of two smaller molecules.

2. A small molecule: This is usually water (H₂O), but it can also be ammonia (NH₃), methanol (CH₃OH), or other small molecules.

Here's how it works:

* Two molecules come together.

* A bond is formed between them, typically through the removal of a water molecule or another small molecule.

* The small molecule is released as a byproduct.

Examples of condensation reactions:

* Formation of a peptide bond: This reaction joins amino acids to form proteins, releasing water as a byproduct.

* Formation of a disaccharide: This reaction combines two monosaccharides to form a disaccharide, releasing water as a byproduct.

* Formation of a polyester: This reaction joins monomers to form a polyester, releasing water as a byproduct.

Key takeaway: Condensation reactions are essential for the formation of large, complex molecules from smaller building blocks. They play a vital role in many biological and industrial processes.