Dyslexia is defined as a neurodevelopmental disorder that interrupts the learning of languages. Dyslexia was first introduced as 'word blindness' by Adolf Kussmaul, a German physician, in the 1870s. Later in 1887, Rudolph Berlin, the German ophthalmologist, reintroduced the term word blindness as 'dyslexia'. Dyslexia falls into two categories: developmental dyslexia and acquired dyslexia. Developmental dyslexia is classified as a lifelong learning disorder that develops from birth into adulthood. Acquired dyslexia occurs in individuals due to any injury that causes a brain disorder. 

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Dyslexia is a learning disorder that affects people negatively in their reading, writing, and recognition of words. It is a disorder caused by differences in brain development and is a condition that runs in families.  Individuals with dyslexia may reflect a diverse range of symptoms in language acquisition, which include problems in decoding and encoding words, struggles with rhymes and phonemes, and difficulties in letter recognition.

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