One common example of a modern-day IC is the computer processor, which typically contains millions or billions of transistors, capacitors, logic gates, etc., connected together to form a complex digital circuit. Although the processor is an IC, not all ICs are processors.

Except for ICs like supervisor and reset ICs, some other device like Programmable Logic Device, DC DC Power Chip, Linear and LOD Regulators, Amplifier and so on are needed for a electronics. Among all these, you may also need a great amplifier for sure.