163. Abstraction

Question.1

A WiFi module hides complex internals behind a simple API:

class WiFiModule {
private:
   void spi_write(uint8_t b) { /* ... */ }
   void handshake_tcp() { /* ... */ }
   int socket_id;
public:
   void connect(const char* ssid, const char* pass) {
       spi_write(0x01);
       handshake_tcp();
   }
};

WiFiModule wifi;
wifi.connect("HomeNet", "1234");

What does abstraction achieve here?

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Performance improvement -- hiding methods makes them faster
Security -- the password is encrypted
The user calls one simple function without knowing it triggers 50 SPI transactions, TCP handshake, and socket management -- complexity is hidden behind a clean interface
Memory savings -- hidden functions use less RAM

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