There were two Boer Wars (three if you count the Boerewors sausage, but few serious military historians do).
First Boer War 1880-1881
Second Boer War 1899-1902
The Boer War was famous for seeing the first use of Marconi radios by the Imperial Yeomanry which had to be transported by mule. Replacements took up to 6 months to arrive (whats new?). The usage of balloons for observation by the Royal Engineers also became more widespread.
Seventy-eight VCs were awarded and some notable battles entered the British consciousness, such as Colenso, Ladysmith, The Relief of Mafeking and Spion Kop. A number of folk who would later go on to be more famous were involved in the Second Boer War, including Baden-Powell and Winston Churchill.