A integrated circuit is built with the primary objective of embedding as many transistors as possible on a single semiconductor chip with numbers reaching in the billions as of 2012.

According to their design assembly, integrated circuits have undergone several generations of advancements and developments such as:

• Small Scale Integration (SSI): Ten to hundreds of transistors per chip
• Medium Scale Integration (MSI): Hundreds to thousands of transistors per chip
• Large Scale Integration (LSI): Thousands to several hundred thousand transistors per chip
• Very Large Scale Integration (VLSI): Up to 1 million transistors per chip
• Ultra Large Scale Integration (ULSI): This represents a modern IC with millions and billions of transistors per chip

An IC can be further classified as being digital, analog or a combination of both. The most common example of a modern IC is the computer processor, which consists of billions of fabricated transistors, logic gates and other digital circuitry.