My company loaded profiles onto my iPad for email and calendars.. There is also a signing certificate and a certificate. What are these for? Additionally are they able to monitor apps and usage, ie Internet usage when it is not on their wifi?

My company loaded profiles onto my iPad for email and calendars.. There is also a signing certificate and a certificate. What are these for?
Additionally are they able to monitor apps and usage, ie Internet usage when it is not on their wifi?
I do not have any VPN enabled?

Do you happen to have an Android?  If so and depending on what version there is a great data usage analyse tool built-in.  See if you can go to Settings -> Data Usage  from there you can pick a current or previous billing cycle and then use the vertical sliders to select a date range and it will filter the usage data per app to show you exactly what app(s) were using data during that time frame.

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    [pre]
    WAN
    |
    | 74.96.170.x (WAN IP)         |
    | Router1(Verizon FiOS Router) |
    | Model: MI424WR-GEN2 (Rev F)  |
    | Firmware: 20.21.0.2          |
    | Def router: 74.96.170.1      |
    | 192.168.1.1 (Local IP)       |
    |
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    |  Router2(Linksys)        |
    |  Model: WRT54GL v1.1     |
    |  Firmware: v4.30.16      |
    |  Def Router: 192.168.1.1 |
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    | Def Router: 192.168.2.1  |
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    [pre]
    WAN 

    | 74.96.170.x (WAN IP)         | 
    | Router1(Verizon FiOS Router) | 
    | Model: MI424WR-GEN2 (Rev F)  | 
    | Firmware: 20.21.0.2          |
    | Def router: 74.96.170.1      |
    | 192.168.1.1 (Local IP)       | 
    |
    |  192.168.1.22 (WAN IP)   | 
    |  Router2(Linksys)        | 
    |  Model: WRT54GL v1.1     |
    |  Firmware: v4.30.16      |
    |  Def Router: 192.168.1.1 |
    |  192.168.2.1 (Local IP)  |
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    | Def Router: 192.168.2.1  | 
    | NO iptables, basic setup |
    [/pre]
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    [pre]
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    default         192.168.2.1     0.0.0.0         UG    2      0        0 enp2s0
    loopback        localhost       255.0.0.0       UG    0      0        0 lo
    192.168.2.0     *               255.255.255.0   U     0      0        0 enp2s0
    [/pre]
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    [pre]
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    192.168.1.0          255.255.255.0   0.0.0.0     1           WAN (Internet)
    0.0.0.0              0.0.0.0         192.168.1.1 1           WAN (Internet)
    [/pre]
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    [pre]
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    Network (Home/Office) 192.168.1.0 192.168.1.1  255.255.255.0 0        Applied 
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    [/pre]
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    [pre]
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     1  192.168.2.1  0.610 ms  0.729 ms  0.735 ms
     2  192.168.1.1  1.843 ms  1.378 ms  1.363 ms
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    13:34:06.175786 IP 192.168.2.160.45999 > 98.139.183.24.http: Flags [S], seq 1122548929, win 0, length 0
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