Pascal case: DatabaseConnection

Camel case:  databaseConnection

// 3 type of case with examples same as its types as mentioned below

PascalCase

camelCase

snake_case

Camel case always starts out lowercase with each word delimited by a capital 

letter (like personOne, textUtil, thingsToDo)

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Pascal case is similar to camel case, but the first letter is always 

capitalized (like PersonOne, TextUtil, ThingsToDo)

​

Snake case means that we delimit words with an underscore

(like person_one, text_util, things_to_do)