Globalisation can be defined as being when human activities take place on a worldwide scale creating an interdependence between countries. When something happens in one area, it can have a knock-on effect in other places. For your GCSE in Geography, you need to be aware of the causes of globalisation plus the positive and negative effects on people and the planet.
There has always been a degree of globalisation but since the end of the Second World War, transport and communications have increased massively, making it much easier to exchange trade and cultural ideas. Companies that operated only in their own countries have been able to expand and have become what are called multinational corporations (MNCs) - companies with subsidiaries in many countries. This is helping to create increased wealth in MEDCs, however, the benefits are less for ordinary people living in LEDCs - they are often seen as a source of cheap labour.