Capacitors for PCB assembly&PCB design
A PCB capacitor (condenser) is a passive electronic component that stores electrical energy in an electric field. Two physical paramaters on a PCB capacitor: Capacitance(μF, microfarads on PCB); Voltage( volts,V)
Capacitors have a key role in fast and easy PCB design like EasyEDA and quick SMT assembly, like JLCPCB service. Such as filter capacitors, decoupling capacitors, and energy storage capacitors are most seen in printed circuit boards.JLCPCB 1-20 layer PCBs can be assembled for free with coupons redeemed: register to get $54 new user coupons and $10 extra PCB+SMT coupon.
Free Assembly for 1-20 layer PCB Capacitor: from Easy EDA to JLCPCB

Join EasyEDA & JLCPCB Electronics Group to design and assemble capacitor properly
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Capacitors help to hold electric charge
And discharge it based on the circuit setup. (used in almost every printed circuit board), such as converting AC to DC power, and especially as power lines filters.
SMD capacitors are vital for PCB assembly
The reason why they are important for PCB assembly are:easy to manufacture, SMD capacitor's package sizes are small which make them easy to be picked and placeed by JLCPCB automated pick&place machines.
SMD capacitors are popular
Such as rechargeable flashlights, razors; solar lights; fluorescent lamps; electric fans, and many more circuit setups.
Lower parasitic inductance
Lower parasitic inductance: no leads are required and the components are smaller means that the level of parasitic inductance is much lower and these capacitors are closer to ideal components in their lead relationship. also SMD capacitors cost less: it helps to achieve production in batch volumes leading to a significant reduction in its manufacturing costs.