The "microfarad" (symbolized $\mu F$) is a unit of capacitance, equivalent to 0.000001 (10 to the -6th power) farad. The microfarad is a moderate unit of capacitance. In utility alternating-current (AC) and audio-frequency (AF) circuits, capacitors with values on the order of $1 \mu F$ or more are common. At radio frequencies (RF), a smaller unit, the picofarad (pF), is often used.
Microfarad
Microfaradio