Suburban colonization means when people move from cities to live in the suburbs.
Imagine that you live in a big city with lots of tall buildings and lots of people. The city is crowded and noisy, and sometimes it's hard to find quiet places to relax. Then one day, your family decides to move from the city to a new area outside the city, called the suburbs.
In the suburbs, there are fewer tall buildings, more green spaces and parks, and fewer people. Instead, there are lots of houses and neighborhoods where people have more space and bigger yards. It's quieter in the suburbs, and you can hear the birds singing and the leaves rustling in the trees.
When lots of people move from the city to live in the suburbs, that's called suburban colonization. It can happen for many reasons. Sometimes people want to escape the noise and crowds of the city. Other times, they want to live in a bigger house with more land. Suburban colonization can change the way that cities and suburbs look and feel, and it can affect how people live and work.