|Passive components (resistors, capacitors, inductors, and circuit protection) are the highest volume components in electronic devices. These components support power management, signal conditioning, and protection of active devices. Sales of these devices are about $30 billion per year. The development and use of passive components are driven by cost, regulatory, and technical requirements in customer segments. Shifts in business patterns have altered the way passive components are developed and used (including embedded passives). This chapter addresses all these major elements and includes 12 tables and 27 figures. There were 25 contributors to the work under the leadership of the Electronic Components Industry Association (ECIA).