What does stemmer do in python nltk library

@pagal_guy wrote:

Hello,

from nltk.stem.porter import *
stemmer = PorterStemmer()

While participating in a Kaggle competition I came across the above library for doing the things as shown below in one of the scripts:

df_all['search_term'] = df_all['search_term'].map(lambda x:str_stem(x))
df_all['product_title'] = df_all['product_title'].map(lambda x:str_stem(x))
df_all['product_description'] = df_all['product_description'].map(lambda x:str_stem(x))

But I am not being able to understand what is being done here,so can someone please help me with this??

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