Board) refers to a printed circuit board, a basic material used to connect and support electronic components.PCB consists of insulating material (usually plexiglass fiber cloth covered with copper foil) and circuit patterns used in the assembly and connection of electronic devices.
PCBA (Printed Circuit Board
Assembly) refers to the process of assembling printed circuit boards. In the PCBA process, electronic components (such as electronic chips, resistors, capacitors, etc.) are soldered to the printed circuit board to form a complete circuit system.
PWA (Progressive Web
App) is a progressive web application, a web application that combines traditional web technologies with modern app features.PWAs are capable of delivering native app-like functionality and user experience, including offline access, push notifications, etc. PWAs can be accessed directly through a browser without downloading and installation.
So PCB is the printed circuit board itself, PCBA refers to the process of assembling the printed circuit board, and PWA is a modern Web application. They each represent different concepts and application areas.