Explanation:

Gurmukhi, which means 'from the mouth of the Guru', was standardized in the 16th century by the second Sikh Guru, Guru Angad. The alphabet is also called 'Paenti' meaning 'thirty five'. Later on, new letters were added to accommodate Persian sounds. The present alphabet consists of forty one letters.
A Gurmukhi vowel is called a 'matra'. Gurmukhi is an abugida in which all consonants have an inherent vowel. Diacritics, which can appear above, below, before or after the consonant they belong to, are used to change the inherent vowel. In the absence of a consonant, the vowel signs are indicated on the first three letters of the alphabet.
The usage of punctuation marks is almost identical to that in English, except for a vertical bar representing the end of a sentence. The script does not make any distinction between upper and lower case letters as in the Latin script.The Gurmukhi script, unlike the Greek and Romans, is arranged in a local fashions.