In order to

In order to is a subordinating conjunction.

We use in order to with an infinitive form of a verb to express the purpose of something. It introduces a subordinate clause. It is more common in writing than in speaking:

[main clause] Mrs Weaver had to work full-time [subordinate clause] in order to earn a living for herself and her family of five children.

We all need stress in order to achieve and do our best work.

The negative of in order to is in order not to:

They never parked the big van in front of the house in order not to upset the neighbours.