If by “real reason” I mean why governments deliberately bring immigrants into a country, there usually isn't one hidden reason. Immigration policy is generally driven by a combination of economic, demographic, humanitarian, and political objectives.
The biggest practical reason for many countries, including Canada, is labour and population growth. Immigrants can fill jobs where employers have difficulty finding enough workers, contribute taxes, start businesses, and increase consumer demand. Canada also has a relatively low birth rate and an ageing population, so immigration is one way of keeping the working-age population from shrinking as quickly.
There are also more specific objectives. Governments may use immigration to:
- fill shortages in sectors such as health care, construction, agriculture and technology;
- increase the number of working-age taxpayers supporting public services;
- attract highly educated or highly skilled workers;
- bring in entrepreneurs and investment;
- reunite families;
- provide protection to refugees and people fleeing persecution;
- maintain population growth in regions that are losing residents;
- strengthen universities and research institutions.
There is also a political dimension. Governments choose immigration levels and categories, and those decisions can reflect the interests of employers, provinces, universities, humanitarian organisations, existing immigrant communities, and voters. That doesn't necessarily mean immigration is being conducted for some secret purpose; it means different groups have different reasons for supporting particular immigration policies.
The economic argument is also more complicated than simply saying “more immigrants = more money.” Immigration can increase total economic output and the size of the labour force, but the benefits and costs aren't distributed equally. Rapid population growth can put additional pressure on housing, infrastructure, health care, schools and transportation if those systems don't expand quickly enough. At the same time, immigrants themselves are workers, taxpayers and consumers, so they also contribute to those systems.
One particularly important distinction is between temporary immigration and permanent immigration. A country might bring in temporary foreign workers to address an immediate labour shortage, while permanent immigration is more closely connected to long-term population and demographic policy.

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