Family reunification is built into work visa systems almost everywhere, so bringing a spouse and children is usually possible, though the generosity varies. The standard package: legally married spouses and minor children qualify as dependents, applying either together with the main applicant or afterwards. Requirements typically include marriage and birth certificates, often apostilled and translated, proof of adequate income and housing, since many countries set salary thresholds for sponsoring family, and health insurance. Unmarried partners are recognized in some countries and not others, and same-sex spouses are recognized where the host country's law allows, both worth verifying for your destination. Some visa categories, notably student and lower-wage permits in certain countries, restrict dependents entirely.
Work rights for spouses are the make-or-break detail families underestimate. The spectrum runs from full open work rights the day they land, common in several skilled migration systems, through work allowed only after a separate permit application, to no work rights at all on a dependent visa. This single rule shapes household income, careers and sanity, so check it before accepting an offer, not after. Dependent children generally access schools, and university-age children may age out of dependent status.
The immigration authority's official pages state all of this precisely for each visa class, and employer relocation teams handle it routinely, so ask them early.