Which is the most used Function of MS EXCEL i.e Vlookup, Hlookup etc for organization ?

Vlookup

data sorting and filtering ;)

Depend upon nature of your work in your organization. There are approx200 functions as per my experince pelase see below functions which are mostly use.

Sum

sumif

sumifs

count

counta

countif

countifs

average

averagea

averageif

averageifa

vlookup

hlookup

if

index

match

iferror

text

and

or

len

left

right

uper

lower

proper

substitute

1.Sorting2. filtering3. Vlookup4.PIVOT

Sum average and filter

VLOOK UP

Sum - Vlookup

I think Vlookup

@sum()

Vlook up & Sumif 

people mostly use Vlookup