What: Walmart expanded its delivery pilot with Instacart to include parts of New York City, where there are no physical Walmart stores.

Why it is important:  The partnership takes advantage of Walmart stores located near the city to fulfill delivery orders via Instacart for customers in the metropolitan area.

The pilot, which started last year in Los Angeles, San Francisco, San Diego and Tulsa, Oklahoma, arrived in Brooklyn, Queens and the Bronx in the expansion.

Walmart and Instacart's growing partnership intensify competition with Amazon, Target, and other stores fighting for consumers' online spending.

Walmart expands Instacart pilot to New York City