Dyslexia is a learning difficulty that mainly affects reading, comprehension, writing, spelling, and written expression. It is not a disease, and it is not related to low intelligence. It is possibly caused by dysfunction of the central nervous system, may be hereditary, and prevents the child from achieving a specific learning goal, even though they have normal intelligence and are exposed to the same educational stimuli as their peers who succeed in that goal. A child with dyslexia usually reads slowly and syllable by syllable, in a flat tone, without understanding word groupings. They may misplace stress, omit, transpose, confuse, or add letters or syllables. In writing, they struggle significantly, work slowly, and often present signs of dysgraphia. They may reverse letters or numbers, misplace stress or leave words unstressed, fail to leave proper spacing between words, and make numerous spelling and grammatical errors. They often have difficulties with spatial and temporal orientation, poor memory, struggle with problem-solving and performing arithmetic operations, have trouble focusing and maintaining attention, possess a limited vocabulary, and find it difficult to follow simple instructions.