what does enumerate do in pzthon code example

Example 1: enumerate python

#Enumerate in python
l1 = ['alu','noodles','vada-pav','bhindi']
for index, item in enumerate(l1):
    if index %2 == 0:
        print(f'jarvin get {item}')

Example 2: enumerate

categorical_features_new=[features for features in df.columns if df[features].dtypes=='object']
for feature in categorical_features_new:
    labels_sorted=df[feature].value_counts().sort_values().index
   
    labels_ordered={k:i for i,k in enumerate(labels_sorted,0)}
    
    df[feature]=df[feature].map(labels_ordered)