Understaning Android mk file

I found this in android.mk file

WCNSS_MAC_SYMLINK := $(TARGET_OUT_VENDOR)/firmware/wlan/prima/wlan_mac.bin
$(WCNSS_MAC_SYMLINK): $(LOCAL_INSTALLED_MODULE)
@echo "WCNSS MAC bin link: $@"
@mkdir -p $(dir $@)
@rm -rf $@
$(hide) ln -sf /mnt/vendor/persist/$(notdir $@) $@

ALL_DEFAULT_INSTALLED_MODULES += $(WCNSS_INI_SYMLINK) $(WCNSS_MAC_SYMLINK)

Can anyone please explain. I am trying to gather knowledge regarding android rom development.