Boundary value analysis is nothing but to check the max and
min length of the field.

Equivalence partition is nothing but to check the valid and
invalid data of the field.

boundary value is nothing but

minimum
maximum
minimum-1
minimum+1
maximum-1
maximum+1

Equavalence testing

Focuses on grouping requirements based on what they have in 
common

B V A meant how many digits its( edit box)accept. and 
equivalnce partioning is which type of charactors accept 
that text or edit box

bounndary value analysis for to test the range of the 
characters in a field
Ex:min+1  chars  pass
   min-1  chars  fail
   max-1  chars  pass
   max+1  chars   fail
Equivalence class partion is for to test the type of the 
characters in a field
Ex: Numerics,alphanumarics ,spl charaters,blank spaces

Equivalence analysis 
a method which helps in reducing the no. of test cases to 
minimum no. 
to select the right test case to cover the overall scenario

BVA
checking beyond the minimum and maximium level 
MAX
MIN
MAX+1
MAX-1
MIN+1
MIN-1
all 6 possibilities