Choosing the right connector affects reliability, cost, and user experience.

Common Connector Types:
- Pin Headers: cheap, prototyping. 2.54mm pitch.
- JST PH/XH: small, reliable low-power wiring.
- USB-C: power + data, modern standard.
- FPC/FFC: flat cables for displays/cameras.
- Screw Terminal: high-power, secure.
- Barrel Jack: simple DC power input.

Selection Criteria:
1. Current and voltage rating
2. Pin count needed
3. Mating cycles
4. Space constraints
5. Cost and availability

For prototypes, pin headers are fine. For production, choose reliable connectors rated for lifetime.