‘If’ usually introduces conditional clauses. The same applies to other conditionals such as unless, should and in case which, however, perform other functions in different contexts. As conditionals, ...

The conditional of hay (there is/there are) is habría (there would be), eg en mi ciudad ideal habría una piscina (in my ideal town, there would be a swimming pool).

The conditional tense is used to say what might happen under certain conditions. It is called the conditional tense because it is dependent on a certain condition, eg you can only fulfil one thing on ...