Any child that is found to be eligible for services under the IDEA is then put on an IEP or Individual Education Plan.
The school writes a personal plan for the child's particular needs. These might include Speech and Language, Occupational Therapy, or Psychologist services. It may also provide for special transportation or modifications in the classroom. The IEP defines exactly what that student needs to help them be successful in the "Least Restrictive Environment" of learning.
These plans are then signed by the school district and the parents and are revisited every year for updating and every three years for a re-evaluation. IEPs are used in the student's classroom to help teachers provide special accommodations or modifications of the lesson plans and assessments.