When you travel abroad for various purposes, you need to submit your personal and educational documents to foreign authorities. Unlike an Indian authority, authorities from foreign countries will not accept documents alone. Documents need to go through an authentication process to legally accept in a foreign country. An apostille is such an authentication method accepted by countries that have joined in the Hague apostille convention. Since India is an apostille convention country, an apostille is the only requirement to authenticate Indian documents in another Hague country. 

A marriage certificate is an important document which has more relevance for immigration purposes, especially for a dependent visa. The marriage certificate apostille obtained from the ministry of external affairs in India makes it a legally accepted document in another Hague country without further steps.