Double-layer PCB: Double-layer PCBs are a type of PCB that have traces of copper on both sides and components are located on both surfaces. These PCBs are better suited for more complex circuits and offer a greater amount of monitoring and more room for component connections.

Multilayer PCB: Multilayer PCBs are a type of PCB that have at least three layers and components are mounted on different layers. These PCBs are ideal for very complex circuits and offer greater amounts of monitoring and more room for component connection.

Flexible PCB: Flexible PCBs are PCBs that are made of plastic or polyester-based materials and are less rigid. These PCBs are ideal for complex three-dimensional designs and, thanks to their foldability, offer more flexible uses.

Rigid-Flex PCB: Rigid-FlexPCBs are a combination of flexible and rigid PCBs. These PCBs are ideal for complex three-dimensional designs and offer more flexible uses.

PCB production technologies and methods differ according to PCB design, and the rapid development of technologies used in PCB production has made PCB production cheaper and faster.

Many options are available for PCB design. Some popular PCB design programs include:

KiCad: KiCad is an open source PCB design program. It has an easy-to-use interface and can be used by both amateur and professional users.

Altium Designer: Altium Designer is a professional PCB design program. It offers high-quality design tools and includes many features that streamline the design process.

Eagle PCB Design: Eagle PCB Design is a PCB design program that can be used by both amateur and professional users. It has an easy user interface and includes many useful features.

CircuitMaker: CircuitMaker is a free-to-use PCB design program. It has an open source interface and is known for its easy use.

DipTrace: DipTrace is a PCB design program that can be used by amateur and professional users. It offers easy to use, wide library options and a good design interface.

Proteus PCB Design: ProteusPCB Design is an electronic circuit design program and can also be used for PCB design. It is easy to use and has a good user interface.

These programs are designed to meet different user needs and offer many useful features for PCB design.