Unity2D collision, if statement

Hello I have this bit of unityCode to check if a character is grounded

`private void FixedUpdate(){ is_on_ground = false;

// The player is grounded if a circlecast to the groundcheck position hits anything designated as ground
// This can be done using layers instead but Sample Assets will not overwrite your project settings.
Collider2D[] colliders = Physics2D.OverlapCircleAll(m_GroundCheck.position, k_GroundedRadius, m_WhatIsGround);
for (int i = 0; i < colliders.Length; i++) {
    if (colliders[i].gameObject != gameObject) {
        is_on_ground = true;
    }
}

}`

Can someone explain what the if-statement if (colliders[i].gameObject != gameObject) does?