BGP address-family ipv4

in some of the configs in the lab i see the "address-family ipv4 unicast neighbor 1.1.1.1 activate" being used but if i remove it still work so how do i know when it is needed or not??? and what does the "neighbor 2.2.2.2 activate"

example config:

R1:

router bgp 65120

neighbor 2.2.2.2 remote-as 100

address-family ipv4 unicast

neighbor 2.2.2.2 activate

R2:

router bgp 65120

neighbor 1.1.1.1 remote-as 100

address-family ipv4 unicast

neighbor 1.1.1.1 activate

 

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