Can you pls. Explain me this code

`timescale 1ns / 1ps

import axi_vip_pkg::*;
import vip_axi4full_axi_vip_0_0_pkg::*;

// Test Bench Signals

bit aclk = 0, aresetn = 1;
bit rsta_busy;
bit [31:0] data, addr, base_addr = 32'hc000_0000;
xil_axi_resp_t resp;
bit [128-1:0] datas = {128'h0000_1111_0000_2222_0000_3333_0000_4444};

module tb_axi4vip( );

vip_axi4full_wrapper UUT
(
    .aclk       (aclk),
    .aresetn    (aresetn),
    .rsta_busy  (rsta_busy)
);

always #10ns aclk = ~aclk;

initial begin
    //Assert the reset
    aresetn = 0;
    #500ns
    aresetn = 1;
end

vip_axi4full_axi_vip_0_0_mst_t      master_agent;

initial begin

    master_agent = new("master vip agent",UUT.vip_axi4full_i.axi_vip_0.inst.IF);
    master_agent.start_master();
    
    wait (aresetn == 1'b1);
    
    #500ns
    myAXI4_WRITE_BURST(base_addr * addr,0,datas,resp);
    
    $display("========end=======");
    #500ns;
    $finish;

end

task myAXI4_WRITE_BURST (
    input xil_axi_ulong     addr,
    input xil_axi_prot_t    prot,
    input bit [128-1:0]     data,
    output xil_axi_resp_t   resp
  );
  master_agent.AXI4_WRITE_BURST(
    0,
    addr,
    4,
    XIL_AXI_SIZE_4BYTE,
    XIL_AXI_BURST_TYPE_INCR,
    XIL_AXI_ALOCK_NOLOCK,
    'h0,
    prot,
    'h0,
    'h0,
    'h0,
    data,
    'h0,
    resp
  ); 
endtask

endmodule