This document discusses examples of smart city initiatives in London, Amsterdam, Andalusia in Spain, and Sao Paulo, Brazil. It outlines how these cities are using digital technologies to improve services for citizens and manage infrastructure more efficiently. London is using real-time traffic and roadwork data to reduce congestion. Amsterdam aims to be more sustainable through clean energy projects and location-based apps for tourists. Andalusia is modernizing through initiatives in smart economy, mobility, environment and governance. Sao Paulo manages huge traffic volumes and supports city services through an Android-based transit management system.