The two-step gel in nail polish gel products typically refers to a system that includes a base coat and a color gel or top coat. The base coat provides adhesion and protection to the natural nails, while the color gel or top coat adds color and finish to the manicure. The two-step gel system is known for its ease of use, long-lasting results, and professional-looking nail designs. To use the two-step gel system, apply the base coat first, cure it under a LED or UV lamp, then apply the color gel or top coat, and cure it again under the lamp for a durable and glossy finish.